unfinished arrow keys to move press and hold space to roll press and hold q to defend a breakdown of the scrolling: 1. the actual level is just a small sprite increased to massive sizes, then changing the size of the costume for it to appear even bigger. 2. The player doesn't actually move. Instead, the level moves by -(player x velocity) and -(player y velocity.) 3. Jumping and moving are all handled by velocity to make it smoother, by changing the position by the velocity and increasing the velocity until it reaches a certain point. you may notice a bunch of glitches: 1. holding down both arrow keys causes the player to move extremely fast, faster than rolling (although it doesn't say it) 2. the x velocity and y velocity don't actually reset until they are put into use again. 3. you can walk off a ledge and not fall until you jump. 4. you can get inside the ground.