Getting to the second half of the game requires a combination of 3 characters, all I'll spill about it is that Brian must be the last one played, and that the other 2 characters are also voices.
The extra characters in Horror Mode can be accessed by typing "Black" on your keyboard
Fun Fact: If you play Crasher's Icon in Mercy Mode, and then immediately place someone else, you can keep Crasher up the entire time during your mix, and if you do it just right, you can even turn Mercy Mode off and Crasher will remain up.
