If it's a theme that would only work for one game or the other try to clarify. Also, please make sure you can actually do something out of your theme suggestion. Provide a few ways for your theme to work, like a good tileset for it, some gimmicks to make it fit the theme more, etc. If you have to pin it down to a really precise glitch, then it's way too specific. If you have no idea how you can make it, it's impossible for the average level designer.
Also, now that we have a brand new thread, try to check previous suggestions now that we don't have about 200 pages of suggestions.



Super Mario 63