I got it! If you are having trouble with this game freezing and locking up when trying to spawn enemies in the Create a Toy Box area then read....
If you have been able to play most areas without it locking up, then this should work.
From main menu, go to Toy Box -> Master Adventures -> Combat Mastery.
Play the little tutorial, which will net you ATLEAST 11 kills, as thats the required amount to complete it. Then once you have complete it, click retry on the results screen. Do this 9 times and its yours.
Broke game...Hope it helps, this simple 200G took me like 4 hours of it locking up and freezing. This helped me complete it with it only freezing once.