risTroyka is a puzzle game combined from the game Tetris and a game called
xTrojka. The name Troyka is derived from the Slovenian word "Trojka", which
means "three" or "triple". If you put last three characters of the word Tetris in
front of the name Troyka, you get a new name risTroyka (Tetris + xTrojka =
risTroyka).