Blockout is a puzzle video game, published in 1989 by California Dreams, developed in Poland by Aleksander Ustaszewski and Mirosław Zabłocki.The game is the logical extension of Tetris into the third dimension. In regular Tetris, the player manipulates a set of tetrominoes which fall into a two-dimensional pit (seen from the side). The aim is to solve a real-time packing problem by forming complete rows, which then disappear and score points.