Tetris
1980s Puzzle — Teaches grid-based logic, piece rotation systems, line clearing, gravity, and score scaling. The most ported game in history — and the best teacher of grid math.
01
Grid & Pieces
Concept: 10x20 grid, 7 tetromino pieces (I, O, T, S, Z, J, L) with rotation. Piece falls at constant rate.
02
Line Clearing
Concept: Full horizontal lines clear with animation. Above lines shift down. Multiple lines = more points.
03
Rotation System
Concept: Wall kick logic — pieces bump against walls and floors instead of getting stuck. SRS or simple kick table.
04
Piece Preview & Hold
Concept: Next piece preview (3 ahead), hold slot (swap stored piece), ghost piece showing landing position.
05
Complete Game
Concept: Level progression (speed increases every 10 lines), score by line count, game over when stack hits top, marathon mode.
5 steps