We can create an app through which user can hybridize/customize the predefined games.
For example we can make user to hybridize between games like chess and carrom.
That is we can have some predefined rules and user wants to modify them to incorporate rules/functionality from other games. Like he can arrange his pieces on board like in carrom and then hit with an striker to break them and Now he can start playing chess from these pieces position. so this way we can provide a way to create a large number of games from a set of say two three games.