After
id Software's
Doom, the game that popularized FPS games but which did not support vertical aiming with a mouse (the y-axis served for forward/backward movement), competitor
3D Realms'
Duke Nukem 3D became one of the first games that supported using the mouse to aim up and down. This and other games using the
Build engine had an option to invert the Y-axis. The "invert" feature actually made the mouse behave in a manner that users now
[update] regard as non-inverted (by default, moving mouse forward resulted in looking down). Soon after, id Software released
Quake, which introduced the invert feature as users now
[update] know it. Other games using the
Quake engine have come on the market following this standard, likely due to the overall popularity of
Quake.
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