How did I get >100% world completion in Super Meatboy?
Solution 1:
There are multiple glitches with the completion percentages. You can find quite a few references to it if you do some searching a bit for "Super Meat Boy" and numbers like "109", "96", etc. Here's an example topic on a forum.
You can mostly ignore the actual numbers it shows, just make sure you beat or A+-ed all the levels, and collected all the bandages. Hopefully it'll be fixed in a patch.