Hi,
I assume most of you already know it but Batman Returns source is available on github.
https://github.com/RetailGameSourceCode/BatmanReturns
You'll find a lot of interesting code but at least, the boot code is here, which should help anyone wanted to start megacd dev.
Of course, it's really similar to Chilly Willy code but perhaps you'll find more details or explanation to help you make your own
Batman Returns - source code
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