Running Bob, you have to blow up keys on the floor to open the door, taking out the lights too I think might give a bonus. To jump press fire and up. The ladders are a bit of a pain at times.
I had to search for a different version of Running Bob as the initial version came with a german crack, which I got past, but wanted it to run better.
Pack 3 should be fine as I've viewed all the screens.
Pack 2 -
https://mega.nz/#!TNMDjQCR!sY0R38XU-...gXcSHWGRTbv-Oo