Summary: I'm using my most advanced collision script (without slope detection) in a "collider" sprite ("Sprite1") and Sprite4 is my movement sprite. Thanks to cheddargirl for her help with the walking animation. Why am I posting it online? I'm testing it in the flash and java players, as well as seeing what kind of lag the animation has. Update October 27, 2011 Changed the script a little. It may be less accurate, but it is also less laggy.