Cover It

Setup Each player secretly draws one of the tiles and checks which symbol is duplicated on the tile. This is the secret symbol for that player. All tiles are then placed next to the game area.

Goal of the game To get four visible symbols of your type to form a square. The square doesn't have to be orthogonal to the tiles.

Game play During the first two turns the players take turns picking a tile turning and rotating it freely and then placing in on top of the play area. Every tile after the first must either touch or overlay an already placed tile. After the fourth tile has been placed the player must take an already placed tile an replay it on the game area still touching or overlaying already placed tiles. The tile replayed cannot be the last tile placed by the opponent. The tile replayed doesn't have to be free, when it is taken. As soon as one player manages to get four of his symbols to form a square he or she has won.

Part of the 4 Tile Contest: http://www.boardgamegeek.com/thread/383408

Freely available: