Is it possible to make a happy wheels type game
Can you make it soo that people can make their own levels and upload them soo other people can play it
I would say yes but it would need careful designing.
As for people making their own levels and sharing it apart from maybe using their own textures I don't see an issue.
Keep in mind C2 might not be the best program to achieve that though.
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everything is possible because If another can do something, its mean you can also do. but I am only playing Happy Wheels game