Game engine
Game engines as an industry
Unreal Engine 4, one of the major game engines and used to create several notable games such as Fortnite, PlayerUnknown's Battlegrounds, and Life Is Strange 2, adopted a free-to-use structure with a royalty on all game sales using this engine. Although the differences among the different game engines blur as they are built upon during the game creation process, different game developers may either be too used to a system to change, or attracted by the huge benefits of such engines regardless of pay-walls.
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