Does anyone know of any sprite-based, customizable games, that are free to download?

What I mean is, a game that has sprites that are stored in Microsoft paint that can be changed by simply changing the files using Microsoft paint. Or if not that, then something else like that, that allows for the customization of sprites. There was a game called 'Super Mario War' that was exactly like this. Very simple to use, you'd just have to locate the paint files and change them and the game would be the same except for how the sprites looked. But the download for it doesn't work anymore for some reason. So I'd like something that operates in the same way. I would prefer a platformer. I'm by no means at all a programmer so this is why I want something simple.
 
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