How do you become a video game creator

You could study game design in university or you could try modding games. There are programs like game maker but they can be complicated for beginner's. Personally i think the best way to get into the industry (if that is what you mean by becoming a game creator) is to mod and design maps and things for games, good luck:)
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Many Universities offer courses in Video Game design/making
(call it what you want :-D)
These courses usually require A levels in math and science (Physics) and of course you have to be realistic with the chances of getting into such a niche career