\n ← → move \n ↑ rotate \n ↓ soft drop \n Space hard drop \n R restart\n
\n
\n
\n\n\n\n\n```",
"reasoning_content": "Need to write a complete Tetris-like game. Single HTML file, canvas, dark theme. Let me write clean code.\n\nPieces: I, O, T, S, Z, J, L \u2014 four squares each (tetrominoes), different colors.\n\nRotation: rotation by offset model. Define rotation states or use matrix rotation. Simplest: define each piece as matrix and rotate by matrix rotation, then do wall-kick attempts for x offset (0, -1, +1, -2, +2). For I piece which is 4x4 matrix rotation.\n\nLet me define pieces as matrices:\n- I: 4x4\n- O: 2x2 (rotation effectively does nothing)\n- T, S, Z, J, L: 3x3\n\nRotate matrix clockwise: newMatrix[x][y] = old[N-1-y][x].\n\nWall kicks: try offsets [0,-1,1,-2,2], check validity. Also small upward kick (dy -1) maybe. Keep simple.\n\nGame loop: requestAnimationFrame and drop timer. Level speed: dropInterval = max(100, 800 - (level-1)*70) or use standard formula.\n\nScoring: 40, 100, 300, 1200 per level times line-clear multiplier.\n\nNext-piece preview: separate small canvas.\n\nGame over: overlay text on canvas, restart with R key.\n\nHard drop: instant drop, lock, plus score. Soft drop speeds up.\n\nLet me write it. Clean dark style. Canvas 10x20, cell 30px \u2192 300x600.\n\nImplement ghost? Not required. Keep simple but polished.\n\nDraw blocks with slight bevel highlight.\n\nPrevent key repeat issues with arrow keys \u2014 use e.preventDefault.\n\nSpawn piece at top center. Game over if spawn collides.\n\nLock: when piece can't move down, gravity-timer handles. On hard-drop, lock immediately.\n\nLet me code:\n\n```js\nconst COLS=10, ROWS=20, SIZE=30;\nconst pieces = { I:{color:'#00d9f5',shape:[[0,0,0,0],[1,1,1,1],[0,0,0,0],[0,0,0,0]]}, O:{...}, T, S, Z, J, L }\n```\n\nValid check: iterate cells of matrix, if filled and (x<0 || x>=COLS || y>=ROWS) return false; if y>=0 && board[y][x] return false.\n\nRotate: rotate matrix clockwise, try kicks.\n\nSoft drop: move down; if invalid, lock. Add points on soft/hard drop.\n\nLevel: lines / 10 + 1.\n\nNext piece: random.\n\nDraw grid, blocks, piece.\n\nGame over state: boolean, draw overlay.\n\nRestart: R key or Enter.\n\nLet me write complete file.\n\nFor keyboard handling: keydown listener, check keys based on state.\n\nAlright, code carefully.\n\nDrop timer based: lastTime, currentTime, accum dropInterval. Use fixed step maybe: setInterval style with delta in rAF.\n\nAlso handle piece lock-out: when piece locks, if any of cells is at y<0 (spawn area above), game over? Standard: if spawn collides game over. Let's do this: if new piece collides at spawn, game over.\n\nRows above come down when line is cleared: standard splice.\n\nFlash effect on line clear? Optional; skip for simplicity, or add short flash. Let's keep simple \u2014 immediate clear.\n\nLet me write the HTML now.\n"
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