Output C, 1 turnECEvan ChaNov 5Build 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.LLMGrok 4.7Gen AI—Skill—SoftwarePlaywright1.9M tokens·30m 43s00
Output D, 1 turnECEvan ChaNov 4Build a dancing Muse: a cute 3D plush mascot with a chubby body, a cream fluffy hood around a round peach face, two small black eyes, rosy cheeks and a tiny smile, short stubby arms and legs, wearing a red hockey jersey with white stripes and black shorts. It dances on its own as soon as the page opens: a real choreographed loop with bounces, arm waves, a spin, a hip sway and a big finish pose, under colorful stage lights with confetti. The fur should look soft and the moves should feel bouncy and alive, with squash and stretch. One self-contained HTML file, no external assets, and it should fill any window. It should feel joyful the moment it loads.LLMGrok 4.7Gen AI—Skill—SoftwareChromium+12.7M tokens·26m 7s00
Output C, 1 turnECEvan ChaNov 1Build a giant domino chain reaction in the browser (Three.js + physics, single HTML page, no external assets). Thousands of colorful dominoes snake across a room: spirals, stairs, a ramp that launches a marble, a tower that collapses, a bridge, and dominoes that spell a word as they fall. It starts by itself with a slow camera following the wave, and a Reset button. It should feel satisfying the moment it loads.LLMGrok 4.7Gen AI—Skill—SoftwareChromium+18M tokens·44m 25s00
Output C, 1 turnECEvan ChaNov 1Build an ant colony simulation in the browser (single HTML page, no external assets). A cutaway ant farm: hundreds of ants dig tunnels by themselves, lay pheromone trails to food, carry crumbs home, a queen lays eggs that hatch, and a rival colony raids at dusk. Click to drop food, and the tunnels keep growing over time. It should feel alive the moment it loads.LLMGrok 4.7Gen AI—Skill—SoftwareChromium+12.6M tokens·32m 15s00
Output C, 1 turnECEvan ChaNov 1Build a fireworks show over a night city skyline in the browser (single HTML page, no external assets). The show runs by itself with peonies, willows, crossettes, heart shapes and a grand finale, lights reflecting in the river, smoke drifting, and the boom arriving a beat after the flash. Click anywhere to launch your own shell. It should feel jaw-dropping the moment it loads.LLMGrok 4.7Gen AI—Skill—SoftwareGoogle Chrome+11.7M tokens·21m 24s00
