Using the purple triangles, Mario can run along the wall. Mario can jump/spin jump off the wall backwards onto ledges or enemies. Mario will be unaffected by Munchers when doing this.
Button Input Header
Hold down the d pad and run button in the direction of the purple triangle to run up the wall. When you have reached the desired height, hit either jump button and change direction on the d pad. For smaller jumps, simply change direction on the d pad. Letting go of run or the d pad at any time will cause Mario to fall off. In smaller wall running areas, there maybe Kaizo Blocks to bar your way to prevent cheese.