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A game engine is a software framework designed for the creation and development of video games. Developers use them to create games for consoles, mobile devices and personal computers.
It's actually much more significant workload to make a game using GZDoom than an engine made for making games. (G)ZDoom wasn't made for making games, it was made for modding doom. The other side of it is yes; it isn't common knowledge that GZDoom is capable of making games. It's never in the discussion for what engine should we use.