Mayhem 2 in Master System is possible to acheive 100% on without any glitches. Easy, no, possible, yes. In general, unless a level requires blockers or bombers for creating the actual path, you can acheive 100% on it in the Sega version. The only exceptions are Fun 11 and Taxing 28, and it should be obvious why 100% is impossible on these two. Fun 11 requires either builders, miners or diggers - which are the three skills you don't have. (You could do it if you had 20 Climbers and Floaters instead of 10, but that would destroy the point of the level anyway.) Taxing 28 should be obvious (for the record, Mayhem 10 is possible despite a similar setup because the fall is much smaller in the SMS version and you still get all 3 floaters, as well as RR1 functioning as MUCH slower).