Tetrys is a one-player puzzle game that challenges the individual to complete horizontal lines by carefully stacking assorted bricks of varying shapes. When a line has been completed, it will disappear from the screen and one line will be added to the line total. The bricks fall from the top of the screen, the speed of which depends on the difficulty level. Each falling block must be properly dealt with before the next one falls. The game is over when the pile of bricks reaches the top of the screen.

The difficulty depends on the user's ability to make perfect lines with the bricks, since lines with gaps help contribute to the build-up of pieces near the top of the screen. The game takes its name from the word for getting four lines simultaneously, the maximum number of lines that can be eliminated at once. ~ Ryan Glover, All Game Guide