TetRLs, another notable 7DRL entry, is a roguelike take on Alexey Pajitnov's classic puzzler, where players assume the role a prisoner forced to participate in a series of experiments inside the laboratory of a mad Soviet scientist. By pressing the D key a new block is dropped at the starting point of a room, and it is up to you to shuffle it downwards and arrange them so that there is enough space to place the next one.

Note that only capital letters are accepted as valid inputs in this game.