Tetra

Tetra is a 1-player Tetris clone for the TRS-80 CoCo.

Seven different geometric shapes appear at the top of the screen. All shapes contain 4 squares except for the straight piece which only has 3 squares. As they descend, the player can rotate and move them laterally to help them fit at the bottom of the play area. If the player completes an entire row, that row is removed and the player gains points. If the blocks reach the top of the play area, it's game over. There are 10 levels of difficulty.