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Stands for "player versus player" and refers to a wide variety of games where players can compete for dominance with one another.

Games that are normally played on a table or other flat surface, such as board games, card games, dice games, miniature wargames, or tile-based games

A turn-based game mechanic is the opposite of a real-time game mechanic. In a Turn-By-Turn mechanic (synonym), each player has to wait for the other to have played, so that they can play, and so on. This way, each player has the time to think about their strategy. TBT games rely less on action than real-time games.