5.02 i think,same gamer
this is no double jump in 8-4 except the wall jump on the floating pipe. Well documented game issue.
Wrong, pipes only take you underground if the camera is in the correct position. which 99.9% of the time it is.
However if you screw witht he camera, pipes can take you to the screen warp before or after then. hence 4-2 and 8-4.