All fixed now, and I have added in Robotnik also, as a playable character. I will look to add in Wario soon, as I have some good examples to work from for him. Just need to pick one and build off of it. Again, sorry about the level issues, when I put in so many, its hard to properly test them all out. They look good at a glance and cause no issues when loaded, but as you have found out. You can only spot them when actually playing through the level fully. I checked the other levels out, so you should be able to hopefully complete the game now.