The Easiest Way to Unlock Everything in Binding of Isaac Afterbirth (No Mods or Cheats Required)
There are also a few instances of a game having completion of over 100% as a joke on the part of the developers. Take, for example, The Binding of Isaac: Afterbirth. This game doesn't ordinarily track completion percentage, but if the player collects and completes everything in the game, a completion percentage of 1001% is displayed on their save file. In Afterbirth Plus, this was changed to 1,000,000%.
Binding Of Isaac Afterbirth 1001 Save Everything Unlocked