Go through a series of 8 looping levels over and over again. 2/16: new background and stair level rework 3/2: press x to change skins. Original, Smith, Golden, Rot 3/13: Level 5 is easier. Rot Skin slightly changed. 2nd collectible added.
Use Up and Right arrows to jump near a wall, then immediately press left arrow to stick. Repeat to climb the wall. You cannot jump from one wall to another wall, you have to go on top of the wall you are on and then jump