I finally unlocked the skin for tony for leaving the crypt in under 15 seconds. I got 14.86 after trying for SEVERAL HOURS. The only thing i have left to unlock in the game are the crypt challenge skins and im not even gonna bother cause the tony one was next to impossible, I had to get lucky by getting a chest i was flying past which gave me socks, and a pot had leveled me up and got lucky to pick the agility tome and i had the perfect room configuration for tony. it requires to many things to line up to make the run possible. i cant imagine the other characters with worse movement. think the challenges are a little to hard for a simple skin. but just my opinion, love the game otherwise