SEBTRIS is a tile-matching puzzle video game where the player must strategically place falling geometric shapes called Tetrominoes onto a rectangular playfield. Each Tetromino consists of four connected blocks arranged in different shapes.

The goal is to create complete horizontal lines without any gaps. When a full line is formed, it disappears, and the player earns points. The game speeds up over time, increasing the challenge. If the blocks stack to the top of the screen, the game is over.

SEBTRIS is known for its simplicity, addictive gameplay, and retro aesthetics, and it's widely considered one of the most iconic and influential video games of all time.