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Wraparound, in video games, is a gameplay variation on the single-screen in which space is finite but unbounded; objects leaving one side of the screen immediately reappear on the opposite side, maintaining speed and trajectory. This is referred to as "wraparound", since the top and bottom of the screen wrap around to meet, as do the left and right sides (in mathematics, this is known as a Euclidean 2-torus).[1] Some games wrap around in some directions but not others, such as games of the Civilization series that wrap around left to right, or east and west but the top and bottom remain edges representing the North and South Pole (in mathematics, this is known as a cylinder). In some games such as Asteroids there is no boundary and objects can travel over any part of the screen edge and reappear on the other side. Others such as Pac-Man, and some games in the Bomberman series, have stages with a boundary surrounding most of the playing area but have few paths connecting the left side to the right, or the top to the bottom, that characters can travel on.
The first commercial arcade video game, Computer Space (1971), featured wraparound space, as did Combat (1977) and Asteroids (1979).[1] Pipe Mania (1989), a puzzle game, features wraparound pipe sections in higher game levels.
Some boardgames like Lunar Rails (2003) and Dragons of Kir (2005) feature wraparound edges.