Game engine?

[lego idiot]

what engine does they used for castle crashers?

[D-ray]

"Behemoth Engine", which basically stands for "nobody knows".
Some people theorized that it's made in Flash, but the Xbox 360 did not support that very "engine", so it's VERY unlikely.

The most "realistic" answer is probably an engine made by Tom Fulp himself (the main programmer of the game).

[T.A.G.]

I don't know what this means but they used actionscript 2.0 to make the game.

[D-ray]

Messaggio originale di T.A.G.:

I don't know what this means but they used actionscript 2.0 to make the game.

Yup, you're right comrade.
I made some more research and it seems to be a combination of C++ (or C#) and Flash (Actionscript 2.0). Still, not entirely Flash tho, it would be a pain to run it now if it was so, just like Vanilla The Binding of Isaac or the Basement Collection itself.