tetris1k

tetris1k is a basic Tetris clone that is designed to work on an unexpanded ZX81 with only 1KB of memory. It plays as can be expected from a game of Tetris with the player being able to move blocks left and right, rotate and insta-drop them to the bottom. A later update of the game has a counter showing how many lines have been cleared although this was not available in the original version.