The Game Boy version of Tetris has a playing field 10 blocks wide. Its standard play area is 10 columns across and 18 rows high, giving the falling tetrominoes a compact vertical well designed for the handheld screen.
That width follows the familiar structure of traditional Tetris. Players move and rotate pieces made of four connected squares, trying to complete horizontal lines without gaps. Once a line is filled, it disappears and the blocks above it descend. The relatively narrow field makes placement precise while leaving enough room for the seven tetromino shapes.
The Game Boy’s monochrome display and small resolution required a clear, efficient layout. The game also shows the next piece in a separate window, although that preview can be turned off. As play continues, the falling speed increases, and the player can select a starting level or begin with partially filled rows.
The 1989 Game Boy release is often remembered for its two-player mode, but each player uses a separate 10-by-18 field. The Game Link Cable connects the consoles, allowing cleared lines to send penalty rows to an opponent.