Tile-matching video game casual games, tile-matching games are designed to be easily accessible and easy to play, which conflicts with a traditional video gaming ethos that demands games to be challenging and punishing. Match-three games are NP-hard when generalized to an n × n playfield and played such that the player knows in advance all the tiles that will appear, with no random chance involved. In particular, it is NP-hard to determine: Tile-matching video game A tile-matching video game is a type of puzzle video game where the player manipulates tiles in order to make them disappear according to a matching criterion. In
Game mechanics in two distinct ways: Examples of tile mechanics include: "Scrabble", in which tiles are letters and players lay them down to form words and score points; and "Tikal", in which players lay tiles representing newly explored areas of jungle, through which archaeologists (represented by tokens) must move to score game points. Worker placement is a game mechanism where players allocate a limited number of tokens ("workers") to multiple stations that provide various defined actions. The worker placement mechanism originates with board games. Stewart Woods identifies "Keydom" (1998; later remade and updated as "Aladdin's Dragons") as the first game to implement