You may use the up, right, and left arrow keys to test out this platform base, and you may use it in your projects- with no credit to me required! :) For a more efficient version, please look here. :) - http://scratch.mit.edu/projects/3083602/
This is a platform base! :) I have tried to make it as efficient as possible, though it can be very bouncy at times. There's no doubt that you've probably seen a more efficient one, though this works. Unfortunately, this one currently doesn't support/feature/include wall-jumping, for it is just one sprite, though can support slopes. The upwards collision detection and side collisions are a little bit inefficient, though.