i just wana ask if what is the very useful software for game development? thanks

ehm ...
an editor and a compiler?
I think you'll need to be a bit more specific.

depending on the kind of game, you should consider which first. do you mean: writing a game from scratch, or do you want to make a mod for an existing game?

then you propably will find tools 'out there' that can help you further.

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