A turn-based game, also known as turn-based strategy, is a game where the game flow is partitioned into well-defined and visible parts, called turns or rounds. For example, when the game flow unit is time, turns represent units of time, like years, months, weeks, or days. A player of a turn-based game is allowed a period of analysis before committing to a game action, ensuring a separation between the game flow and the thinking process, which in turn leads presumably to better solutions. Once every player has taken his turn, that round of play is over, and any special shared processing, is done. This is followed by the next round of play.
Types
TBS games come in two flavours, depending on whether inside a turn players play simultaneously or take their (mini-)turns. The former games fall into the simultaneously-executed TBS games (also called phase-based or "WeGo"), with Diplomacy being a notable example. The latter games fall into player-alternated TBS games (also called "IGOUGO"), and are subsequently subdivided into (A) ranked, (B) round-robin start, (C) random and (D) initiative-based -- the difference being the order under which players start within a turn: (A) the first player being the same every time, (B) the first player selection policy is round-robin, (C) the first player is randomly selected, and (D) the first player is selected based on an initiative score.
An additional sub-category under phase-based games is the category of clock-based games. Clock-based games differ from phase-based games, in that players are allowed a maximum of only one action per turn, as opposed to possibly several (using an Action or Movement Point pool, for instance). Most roguelike games fall under this category.
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