Okey is a tile-based game, very popular in Turkey. It is almost always played by four players, although, in principle, it can be played by two or three players. It is very similar to the game Rummikub, as it is played with the same set of boards and tiles, but under a different set of rules. The game was derived from the original Rummikub after cultural contacts of Gastarbeiter in Germany.[citation needed] In Turkey and among Turkish communities abroad, it is very popular at cafés.