Welltris description

One of the variants of development of the themes of Tetris, written by Pajitnov.

The basic principle of the game remains the same, but the pieces are now falling not down, but flow down the four walls of the "glass" on a flat bottom. Unlike 3D Tetris, the goal here is not to fill the entire bottom, and only in the formation of single lines. If part of the figure, when lowered, remains on the wall, the wall blocks and other shapes on it to move anymore. To unblock it, you need to either roll one of the lines or punch from the opposite side. The end comes when all four walls of the "glass" blocked. Probably one of the most difficult variants of the game. The gameplay is accompanied by a favorite with Western audiences with scenes of life of the perestroika of the Soviet Union.