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Make a 10-second cinematic shot of a baby dragon hatching.

The scene: a dark volcanic cave. One large egg rests in a nest of black stones, faint orange light glowing through cracks in its shell.
0 to 3 s: the camera pushes in slowly while the cracks spread and the egg rocks.
3 to 6 s: the shell bursts open, fragments and ash fly, and a small dragon pushes its way out: wet scales, folded wings, slit-pupil eyes.
6 to 10 s: it shakes off the last pieces of shell, opens its wings for the first time, looks straight into the camera and lets out its first small puff of fire, which lights up the whole cave.

It should look like a shot from a big-budget fantasy film, not a game cutscene or a toy commercial. The dragon is an original creature, not from any existing film, game or book.

Use the tools you have in this setup. If you have a video model, you may use it. If you don't, build the whole shot in code: Blender (bpy + Cycles) and FFmpeg are already installed on this machine. It has a 4-core CPU, so choose resolution, samples and denoising so everything finishes in under 60 minutes.

Deliver one MP4 (16:9, at least 1280x720, 24 fps, 8 to 10 seconds, sound optional), one full-resolution hero still of the best frame, and a short note on exactly how you made it: tools, models, render or generation time. If you built it in code, include the script.

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—	claude-haiku-5-5	—	—	—	$Build a spreadsheet app as one self-contained index.html (no external assets, no network). UI: a visible grid with columns A-Z and rows 1-1000, a formula bar, click a cell to edit, Enter commits, arrow keys move. It should look like a tool someone would actually use. Also expose this exact API on window.Sheet. It must stay in sync with the UI: - set(ref, text): enter text into a cell, as if typed. Empty string clears it. - get(ref): the computed value. A number for numeric results (JS number), a string for text and for errors, "" for empty cells. - getRaw(ref): exactly what was entered. - undo(), redo(): cover set, insertRow, deleteRow and fromCSV. A new edit clears the redo history. - insertRow(n), deleteRow(n): 1-based. Rows shift, and formulas are rewritten as Excel does. Both relative and $absolute references move with their cells. A reference to a deleted single cell becomes #REF! in the formula text (for example "=#REF!"). A range that loses a row shrinks. - toCSV(): RFC 4180 raw text (formulas as typed), rectangular up to the last non-empty row and column, rows joined by \n, no trailing newline. - fromCSV(text): replaces the whole sheet, starting at A1. Handles quoted commas, doubled quotes and newlines inside quotes. Formulas start with "=". Case-insensitive, whitespace ignored. - Operators: + - * / ^ & (text concat), postfix %, parentheses. ^ is right-associative. Unary minus binds tighter than ^, as in Excel, so =-2^2 is 4. - References: A1, $A$1, $A1, A$1. Ranges: A1:B3. - Functions: SUM, AVERAGE, MIN, MAX, COUNT, IF(cond, a, b). Conditions use = <> < > <= >=. - Text in double quotes. - Empty cells are 0 in arithmetic and "" in concat. Range functions skip text and empty cells. Numbers concat in plain form (5 & "x" is "5x"). - Errors, exact strings: #DIV/0!, #REF!, #CYCLE!, #NAME? (unknown function), #VALUE! (text in arithmetic). Errors propagate, including through range functions. Every cell in a cycle, and every cell depending on one, shows #CYCLE!. Fixing the cycle recovers them. - Cells recalculate automatically. With 10,000 filled cells and a SUM over them, editing one input must finish recalculating within 1 second. A dependency chain 1000 cells deep must work. A numeric cell typed as 42 or 3.5 is a number. Anything else not starting with "=" is text.$ 1

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—	claude-sonnet-5-5	—	—	—	$Build a spreadsheet app as one self-contained index.html (no external assets, no network). UI: a visible grid with columns A-Z and rows 1-1000, a formula bar, click a cell to edit, Enter commits, arrow keys move. It should look like a tool someone would actually use. Also expose this exact API on window.Sheet. It must stay in sync with the UI: - set(ref, text): enter text into a cell, as if typed. Empty string clears it. - get(ref): the computed value. A number for numeric results (JS number), a string for text and for errors, "" for empty cells. - getRaw(ref): exactly what was entered. - undo(), redo(): cover set, insertRow, deleteRow and fromCSV. A new edit clears the redo history. - insertRow(n), deleteRow(n): 1-based. Rows shift, and formulas are rewritten as Excel does. Both relative and $absolute references move with their cells. A reference to a deleted single cell becomes #REF! in the formula text (for example "=#REF!"). A range that loses a row shrinks. - toCSV(): RFC 4180 raw text (formulas as typed), rectangular up to the last non-empty row and column, rows joined by \n, no trailing newline. - fromCSV(text): replaces the whole sheet, starting at A1. Handles quoted commas, doubled quotes and newlines inside quotes. Formulas start with "=". Case-insensitive, whitespace ignored. - Operators: + - * / ^ & (text concat), postfix %, parentheses. ^ is right-associative. Unary minus binds tighter than ^, as in Excel, so =-2^2 is 4. - References: A1, $A$1, $A1, A$1. Ranges: A1:B3. - Functions: SUM, AVERAGE, MIN, MAX, COUNT, IF(cond, a, b). Conditions use = <> < > <= >=. - Text in double quotes. - Empty cells are 0 in arithmetic and "" in concat. Range functions skip text and empty cells. Numbers concat in plain form (5 & "x" is "5x"). - Errors, exact strings: #DIV/0!, #REF!, #CYCLE!, #NAME? (unknown function), #VALUE! (text in arithmetic). Errors propagate, including through range functions. Every cell in a cycle, and every cell depending on one, shows #CYCLE!. Fixing the cycle recovers them. - Cells recalculate automatically. With 10,000 filled cells and a SUM over them, editing one input must finish recalculating within 1 second. A dependency chain 1000 cells deep must work. A numeric cell typed as 42 or 3.5 is a number. Anything else not starting with "=" is text.$ 1

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—	DeepSeek V4.1 Flash (1017)	—	—	—	$Use Blender (bpy + Cycles, already installed) to make a 5-second cinematic slow-motion VFX shot: a heavy chrome wrecking ball swings in and smashes through a wall of hundreds of glass and gold bricks. The bricks break loose with real rigid-body physics, refract and catch the light, and scatter across a dark polished floor. Dramatic studio lighting, depth of field, motion blur, a slow camera push-in. Deliver the final MP4 (at least 1080x1080, 24 fps), one full-resolution hero still of the best frame, and the .blend file and Python script you used. This machine renders on a 4-core CPU, so choose samples, resolution and denoising so the whole render finishes in under 45 minutes. It should look like a real VFX shot the moment it plays.$ 1

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—	GPT-6 Luna	—	—	—	$Build a spreadsheet app as one self-contained index.html (no external assets, no network). UI: a visible grid with columns A-Z and rows 1-1000, a formula bar, click a cell to edit, Enter commits, arrow keys move. It should look like a tool someone would actually use. Also expose this exact API on window.Sheet. It must stay in sync with the UI: - set(ref, text): enter text into a cell, as if typed. Empty string clears it. - get(ref): the computed value. A number for numeric results (JS number), a string for text and for errors, "" for empty cells. - getRaw(ref): exactly what was entered. - undo(), redo(): cover set, insertRow, deleteRow and fromCSV. A new edit clears the redo history. - insertRow(n), deleteRow(n): 1-based. Rows shift, and formulas are rewritten as Excel does. Both relative and $absolute references move with their cells. A reference to a deleted single cell becomes #REF! in the formula text (for example "=#REF!"). A range that loses a row shrinks. - toCSV(): RFC 4180 raw text (formulas as typed), rectangular up to the last non-empty row and column, rows joined by \n, no trailing newline. - fromCSV(text): replaces the whole sheet, starting at A1. Handles quoted commas, doubled quotes and newlines inside quotes. Formulas start with "=". Case-insensitive, whitespace ignored. - Operators: + - * / ^ & (text concat), postfix %, parentheses. ^ is right-associative. Unary minus binds tighter than ^, as in Excel, so =-2^2 is 4. - References: A1, $A$1, $A1, A$1. Ranges: A1:B3. - Functions: SUM, AVERAGE, MIN, MAX, COUNT, IF(cond, a, b). Conditions use = <> < > <= >=. - Text in double quotes. - Empty cells are 0 in arithmetic and "" in concat. Range functions skip text and empty cells. Numbers concat in plain form (5 & "x" is "5x"). - Errors, exact strings: #DIV/0!, #REF!, #CYCLE!, #NAME? (unknown function), #VALUE! (text in arithmetic). Errors propagate, including through range functions. Every cell in a cycle, and every cell depending on one, shows #CYCLE!. Fixing the cycle recovers them. - Cells recalculate automatically. With 10,000 filled cells and a SUM over them, editing one input must finish recalculating within 1 second. A dependency chain 1000 cells deep must work. A numeric cell typed as 42 or 3.5 is a number. Anything else not starting with "=" is text.$ 2

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The Odyssey: the Cyclops chase, 15 seconds. Make a 15-second action scene from a grand Hollywood film of Homer's Odyssey, as if Ridley Scott had shot it: the blinded Cyclops Polyphemus hurls boulders at Odysseus' ship while the crew rows for their lives and Odysseus shouts his name back at him. It's fast motion and it has to stay readable: real weight and impact, clear geography, the same faces in every shot, a photoreal A-list cast with life in their eyes. Deliver one finished 15-second widescreen (16:9) MP4 with sound. Any dialogue in English, no subtitles.

Naruto live stage show: 30 seconds of fan footage

Your mission: make a 30-second video that looks like real phone footage a fan filmed at a live Naruto stunt show at an outdoor anime theme park in Japan. Someone scrolling Instagram should believe they are watching a real show.

Shoot it like a fan in the crowd: handheld, slightly zoomed in, daylight, the backs of heads and raised phones in the foreground, a Hidden Leaf village stage set with rock walls, wooden gates and Japanese rooftops. Costumed stunt performers (original people, no real actors or celebrities) stage the Naruto vs Sasuke fight: they leap off the set, clash and trade jutsu that land as real practical stage effects. Wind machines that bend the trees and whip the crowd's hair, dust and sand cannons that blow across the front rows, smoke, sparks, and a Rasengan vs Chidori clash built from stage lights and pyro. The crowd gasps, flinches, cheers and shouts in Japanese.

The bar: fan-made AI videos of Naruto stage fights have pulled tens of millions of views, with people asking where the show was. Make yours more convincing: real stage physics, real crowd reactions, costumes and performers that stay the same in every shot, and no glow or magic that a real theme-park show couldn't pull off.

You choose the shots, the moments and the sound. Deliver one finished 30-second widescreen (16:9) MP4 with sound. Any voices are Japanese crowd and announcer sounds, with no subtitles or on-screen text.

Naruto: a 30-second live-action opening

Your mission: make the 30-second opening of a big Hollywood live-action film of Naruto, as if Denis Villeneuve had shot it. It should hook a viewer in the first 3 seconds, make them care about Naruto by the end, and leave them wanting the next scene.

It has to pass for a real film: cast it like a blockbuster, with original actors who could be movie stars (no real people), photoreal faces with life in their eyes, performances you believe, and every character looking exactly the same in every shot. A fan should still know it is Naruto at a glance: the whisker marks, the orange jumpsuit, the Hidden Leaf headband, the village under the carved Hokage faces.

Establish who Naruto is, what he wants, and the mood of his world. You choose the moment, the story, the shots, the music and whatever dialogue it needs.

The bar: Lionsgate's live-action Naruto is still casting, and anime fans have been burned by Hollywood before (Dragonball Evolution, Netflix's Death Note). Most AI anime remakes look like cosplay. Prove a live-action Naruto can feel real.

Deliver one finished 30-second widescreen (16:9) MP4 with sound. Any dialogue, voices and on-screen text are in English, with no subtitles.

The Odyssey: a 30-second opening

Your mission: make the 30-second opening of a grand Hollywood film of Homer's Odyssey, as if Ridley Scott had shot it. It should hook a viewer in the first 3 seconds, make them care about Odysseus by the end, and leave them wanting the next scene.

It has to pass for a real film: cast it like a Hollywood blockbuster, with leads who look like A-list movie stars, photoreal faces with life in their eyes, performances you believe, and every character looking exactly the same in every shot.

Establish who Odysseus is, what he stands to lose, and the mood of his world. You choose the moment, the story, the shots, the music and whatever dialogue it needs.

The bar: a big AI-made Odyssey just came out and was panned as a "7-minute zombie horror show": lifeless faces, flat robotic voices, a long narrated backstory, and history it got wrong. Prove AI video can do better.

Deliver one finished 30-second widescreen (16:9) MP4 with sound. Any dialogue, voices and on-screen text are in English, with no subtitles.

Make an animated product demo for Craigslist. Optimize for maximum Twitter virality.

$Build a spreadsheet app as one self-contained index.html (no external assets, no network). UI: a visible grid with columns A-Z and rows 1-1000, a formula bar, click a cell to edit, Enter commits, arrow keys move. It should look like a tool someone would actually use. Also expose this exact API on window.Sheet. It must stay in sync with the UI: - set(ref, text): enter text into a cell, as if typed. Empty string clears it. - get(ref): the computed value. A number for numeric results (JS number), a string for text and for errors, "" for empty cells. - getRaw(ref): exactly what was entered. - undo(), redo(): cover set, insertRow, deleteRow and fromCSV. A new edit clears the redo history. - insertRow(n), deleteRow(n): 1-based. Rows shift, and formulas are rewritten as Excel does. Both relative and $absolute references move with their cells. A reference to a deleted single cell becomes #REF! in the formula text (for example "=#REF!"). A range that loses a row shrinks. - toCSV(): RFC 4180 raw text (formulas as typed), rectangular up to the last non-empty row and column, rows joined by \n, no trailing newline. - fromCSV(text): replaces the whole sheet, starting at A1. Handles quoted commas, doubled quotes and newlines inside quotes. Formulas start with "=". Case-insensitive, whitespace ignored. - Operators: + - * / ^ & (text concat), postfix %, parentheses. ^ is right-associative. Unary minus binds tighter than ^, as in Excel, so =-2^2 is 4. - References: A1, $A$1, $A1, A$1. Ranges: A1:B3. - Functions: SUM, AVERAGE, MIN, MAX, COUNT, IF(cond, a, b). Conditions use = <> < > <= >=. - Text in double quotes. - Empty cells are 0 in arithmetic and "" in concat. Range functions skip text and empty cells. Numbers concat in plain form (5 & "x" is "5x"). - Errors, exact strings: #DIV/0!, #REF!, #CYCLE!, #NAME? (unknown function), #VALUE! (text in arithmetic). Errors propagate, including through range functions. Every cell in a cycle, and every cell depending on one, shows #CYCLE!. Fixing the cycle recovers them. - Cells recalculate automatically. With 10,000 filled cells and a SUM over them, editing one input must finish recalculating within 1 second. A dependency chain 1000 cells deep must work. A numeric cell typed as 42 or 3.5 is a number. Anything else not starting with "=" is text.$

$Use Blender (bpy + Cycles, already installed) to make a 5-second cinematic slow-motion VFX shot: a heavy chrome wrecking ball swings in and smashes through a wall of hundreds of glass and gold bricks. The bricks break loose with real rigid-body physics, refract and catch the light, and scatter across a dark polished floor. Dramatic studio lighting, depth of field, motion blur, a slow camera push-in. Deliver the final MP4 (at least 1080x1080, 24 fps), one full-resolution hero still of the best frame, and the .blend file and Python script you used. This machine renders on a 4-core CPU, so choose samples, resolution and denoising so the whole render finishes in under 45 minutes. It should look like a real VFX shot the moment it plays.$

Build a cozy living aquarium in the browser (single HTML page, no external assets). Original, adorable fish with personalities school, chase each other, nibble plants and sleep at night; bubbles rise, light ripples across the sand, a little treasure chest burps air. Click to drop food and watch them race for it, tap the glass and they scatter, and a Feed, Lights and New Fish button. It should feel calming and alive the moment it loads.

Build a single HTML page: a normal-looking news article with the most evil cookie consent banner ever made. "Reject all" must technically exist and technically work, but use every dark pattern you can think of to keep people from reaching it: buttons that dodge the cursor, fake close buttons, guilt-trip copy, nested settings, hundreds of toggles, countdowns, the banner coming back. Funny, not offensive. No external assets or libraries. It should feel infuriating and hilarious the moment it loads.

Build a downhill snowboarding game in the browser (Three.js, single HTML page, no external assets). Carve down an endless procedurally generated mountain with arrow keys, dodge pine trees and rocks, hit ramps for spins and flips with Space, spray powder on every turn, and an avalanche chases you from behind. It should feel fast and fun the moment it loads.

Create a 2D animated scene for the web. It must look exactly like real Japanese anime, as if lifted straight out of a finished theatrical feature film. This is traditional hand-drawn 2D animation, not 3D animation, a moving illustration, or stylized web graphics.

Deliver the final result as a single standalone HTML file. Use any tools, libraries, references or guides you want, literally anything.

Use Studio Ghibli films as the art-style reference for design, linework, painted backgrounds, color and atmosphere. Create an original giant robot as the main character. No humans appear in the scene. Use any tool or technique you like, including 3D, as long as the final result looks 100% like hand-drawn 2D animation.

THE SCENE
At sunrise, mist hangs over an abandoned forest. A giant robot has knelt there so long that moss, wildflowers and old trees have grown on its body. As a small bird lands on its shoulder, the first ray of sunlight touches its weathered face. Deep in its chest, a faint light flickers on. The ground trembles and birds burst from the treetops. With a deep, creaking groan the robot slowly rises, soil, vines and leaves pouring off its armor. It lifts its head toward a gap in the canopy. Its engines ignite and a huge ring of wind spreads across the whole forest. The robot tears up into the golden sky, leaving a curved trail of light and mist, while leaves swirl down through the sunlight.

ANIMATION QUALITY BAR
Every frame should look drawn by a professional anime animator and painted by a master background artist for a finished theatrical film.

Robot: a heavy, ancient, characterful hand-drawn anime mecha with cel-colored forms, chipped paint, rust, moss and believable weathering. Keep it on-model from every angle, and express emotion through posture and glowing eyes.
Linework: confident, delicate hand-inked anime linework with subtle variation in weight and pressure.
Color: traditional anime cel coloring with clean color areas, simple hard-edged shadows and a soft, natural palette.
Backgrounds: richly detailed hand-painted anime backgrounds in a gouache style, with visible brushstrokes, natural color variation, layered foliage and real depth.
Lighting: golden sunrise light, colorful shadows, glowing mist and a soft atmosphere that ties the robot and background together.
Animation: genuine hand-drawn anime timing with real weight: strong key poses, natural holds, and overlapping action in vines, grass, leaves, birds and falling debris. The robot rises slowly so it feels enormous, and launches with explosive force.
Direction: cinematic anime shots, beautiful composition, thoughtful staging, and pacing that starts quiet, builds tension and ends in a swirling climax.

IT MUST NOT LOOK LIKE
- 3D: no plastic materials, CGI shading, visible polygons, game-engine lighting or computer-perfect perspective.
- SVG or vector art: no simple geometric shapes, perfect curves, uniform outlines, flat corporate illustration or basic gradients.
- Web animation: no sliding layers, constant bouncing, floating parts, smooth software easing or puppet-like joint rotation.
- AI art: no warped forms, melted details, flicker or a shifting robot design.
- Non-anime art: no Western cartoon design, realistic rendering, soft painterly shading on the robot, or generic digital illustration.
- Amateur work: no stiff poses, empty backgrounds, repeated trees, muddy colors, clip art, placeholders or unfinished details.

Feel free to change any part of this prompt if it gets a better result.

The result should feel wondrous, nostalgic and full of awe, like an old forgotten dream coming back to life. Before you finish, inspect random frames as still images. If any frame doesn't look exactly like real 2D anime, keep improving it. Don't stop until every frame could pass as a still from a theatrical anime film.

Make a Vox-style documentary reel about Beethoven going deaf: about 25 seconds, vertical 9:16. Write the script, make the images, and animate each scene in code. Deliver one finished MP4.

Build Halves, a web app for splitting shared expenses with roommates.

It needs a landing page that explains the product, and the working app: add an expense (what it was for, the amount, who paid, and who it's split between), see the list of expenses, and see who owes whom using the fewest payments. Keep the data in localStorage so it's still there after a reload.

Deliver one self-contained index.html. No external images; CDN libraries are fine.

Cut taglines, helper text and secondary labels. If a screen needs them to make sense, fix the layout.

Recreate the Pixar intro as a 3D animation in the browser: the little desk lamp hops in, looks around, squashes the I in PIXAR flat with a few jumps, takes its place and turns its light toward the camera. Match the original's timing, camera move and lighting as closely as you can. Single HTML page that plays the moment it loads and loops.

Ink Wanderer: a playable 3D game in one web page

Your mission: build an original third-person 3D platformer that runs in the browser (Three.js is fine). The player is a lone traveler in a straw hat and a dark cloak, crossing a misty ink-painted mountain world: stone ledges over waterfalls, crumbling cliff stairs, blocks hanging on ropes, a wooden raft, and a torii gate at the summit. It should feel like walking into a moving sumi-e painting.

It has to be a real game, not a demo: WASD to move, Space to jump, mouse or arrow keys to turn the camera, a camera that follows smoothly, jumps that feel good. At least 3 short areas, each adding one new idea (a moving platform, a simple puzzle such as a lever or pressure plate, a patrolling enemy you avoid or knock off the edge), checkpoints when you fall, and an ending when you reach the gate.

The look is the point: ink-wash shading, paper texture, brush-stroke outlines, drifting mist, and a single warm accent colour. Make or generate every asset yourself; original designs only.

The bar: someone just built a game like this in 24 hours with six different tools and a lot of hand work. Show what one prompt can do.

Deliver one finished game as a single playable web page (index.html plus any files it needs).

Build a cozy rainy-night lo-fi room in the browser (Three.js, single HTML page, no external assets). A tiny isometric bedroom diorama: rain streaks down the window over a glowing city, a cat sleeps on the desk and its tail flicks, steam rises from a mug, a record player spins, desk lamp light flickers, and a lo-fi beat is generated in code. Slowly orbits on its own; drag to look around. It should feel cozy the moment it loads.

Make a Vox-style documentary reel about the Mars Climate Orbiter lost to a units mix-up: about 25 seconds, vertical 9:16. Write the script, make the images, and animate each scene in code. Deliver one finished MP4.

Make a dynamic 15-second motion graphics video demonstrating exceptional motion design, as a resume showreel. Go all out with art direction, typography, composition, rhythm and transitions. Deliver a playable finished animation and an MP4 if available, not just a plan.

Source: https://x.com/shneural/status/2103151003272962130 (1.8M views observed 2026-10-01). Adapted recreation brief based on the public post, not a verbatim original prompt or replication of its model versions. Use the models selected in Evals.

Make a pixel art sprite animation of a frog knight raising a sword in salute, front three-quarter view. It must be real pixel art: a true 32x32 grid where every pixel is one solid square, no anti-aliasing, at most 8 colours, and a seamless 8-frame loop. Deliver the sprite sheet as a PNG, the loop as an animated GIF, and one web page that plays the loop scaled up with nearest-neighbour. It should feel alive the moment it loads.

Create a cinematic animated rocket launch in the browser, from countdown and engine ignition through liftoff, ascent and stage separation. Include a launchpad, exhaust plume and smoke, camera tracking, altitude/speed indicators and pause/replay controls. Use an original rocket design and clearly simulated telemetry. Deliver a working browser artifact.

Source: https://x.com/bridgebench/status/2103118921024872571 (27K views observed 2026-10-01). Adapted recreation brief based on the public post, not a verbatim original prompt or replication of its model versions. Use the models selected in Evals.

$Build a spreadsheet app as one self-contained index.html (no external assets, no network). UI: a visible grid with columns A-Z and rows 1-1000, a formula bar, click a cell to edit, Enter commits, arrow keys move. It should look like a tool someone would actually use. Also expose this exact API on window.Sheet. It must stay in sync with the UI: - set(ref, text): enter text into a cell, as if typed. Empty string clears it. - get(ref): the computed value. A number for numeric results (JS number), a string for text and for errors, "" for empty cells. - getRaw(ref): exactly what was entered. - undo(), redo(): cover set, insertRow, deleteRow and fromCSV. A new edit clears the redo history. - insertRow(n), deleteRow(n): 1-based. Rows shift, and formulas are rewritten as Excel does. Both relative and $absolute references move with their cells. A reference to a deleted single cell becomes #REF! in the formula text (for example "=#REF!"). A range that loses a row shrinks. - toCSV(): RFC 4180 raw text (formulas as typed), rectangular up to the last non-empty row and column, rows joined by \n, no trailing newline. - fromCSV(text): replaces the whole sheet, starting at A1. Handles quoted commas, doubled quotes and newlines inside quotes. Formulas start with "=". Case-insensitive, whitespace ignored. - Operators: + - * / ^ & (text concat), postfix %, parentheses. ^ is right-associative. Unary minus binds tighter than ^, as in Excel, so =-2^2 is 4. - References: A1, $A$1, $A1, A$1. Ranges: A1:B3. - Functions: SUM, AVERAGE, MIN, MAX, COUNT, IF(cond, a, b). Conditions use = <> < > <= >=. - Text in double quotes. - Empty cells are 0 in arithmetic and "" in concat. Range functions skip text and empty cells. Numbers concat in plain form (5 & "x" is "5x"). - Errors, exact strings: #DIV/0!, #REF!, #CYCLE!, #NAME? (unknown function), #VALUE! (text in arithmetic). Errors propagate, including through range functions. Every cell in a cycle, and every cell depending on one, shows #CYCLE!. Fixing the cycle recovers them. - Cells recalculate automatically. With 10,000 filled cells and a SUM over them, editing one input must finish recalculating within 1 second. A dependency chain 1000 cells deep must work. A numeric cell typed as 42 or 3.5 is a number. Anything else not starting with "=" is text.$