This is one of those annoying auto-scroll levels so if you mess up even a little you are punished with death. It's quite insidious!
Are there any invisible instant-death nobody-expects-a-cloud-to-be-fatal in the middle of where you MUST jump?
Are there any freakin' lasers firing where youa re helplessly landing from a jump as at the very end of the level?
Anything along those lines, that's enough to convince me to seek out that difficult/mean SMW level ... and get my son to play it through
