Super Platform Game Engine of Fun
This is a platform game engine for Scratch (a Mario type game, in other words). It supports slopes, walls, jumping, etc. It doesn't support platforms in the air as of yet (the collision is messed up). Everything is still a little buggy, especially the walls. This isn't color-based like many other Scratch platform engines (though at first it was), so you can use it with any level. The level has to be a sprite, though; it can't be in the background.
The jumping script was borrowed and tweaked a little from Chupi's Mario Cat program. Credits to him for that.
The wall detection system uses an invisible sensor sprite that tracks the character's movements to detect the walls.
This is more of a tech demo than a real game. It can be used to make a real game, though.