What four bosses are on the Difficult Boss Battles Mount Rushmore?

Board 8

LeonhartFour posted...
*sees Bowser (Super Mario 64) at 100*

LOL
I also lol'd at that

I have 3 I'm pretty set on, trying to figure out my 4th......
azuarc wasn't even home. he was playing Magic the Gathering at his buddy's store, which is extremely easy to verify