Thanks, that's what I thought too, that GBC dumps are always the same. After all, doesn't the GBC Bootstrap actually check the internal checksum as one copy protection step? Interesting that it's apparently due to the MX-chip. I hope then that his can be fixed (again). Do you have a list of MX-chip games? I can test others then. Don't have Toy Story Racer but I do have another Powerpuff game.