I found a sequence break in the level Contamination ( starts at 0:12 ) . This allows you to skip more than half of the 1st maze. B.O.B will fall down the horizonal grate if more than 40% of his character model touches it. However, if you move toward the vertical grate's edge in the vod at 0:14 while overlapping exactly 40% of B.O.B on the horizontal grate, you can pass though the edge and be pushed to the right. grate This was done on a NTSC copy of the PS2 game. Not sure exactly how much time it saves nor whether it can be done on other consoles & PC.

Wow nice skip.