I just finished getting all of the bandages and A+ on every level in world 2 of Super Meatboy. Somehow, this has resulted in me having a completion of 109%. I figured "meh, probably some screwy thing about A+ on the glitch stage too". So I made sure I have every bandage and A+ on every stage in world 1. I do, but the % is only 100.
Is >100% achievable in every world? If so, what's the general strategy for getting it?