Unlocked the new character, he can be a real killer in a lot of situations.
Still trying to figure out what a lot of those left-corner items do. I figured out the flat penny.
I found a glitch too. If you do any of the challenges, your next regular run will still have the same stipulations as the challenge run. And since you can pick any character in normal games, you can do stuff like have ???? immediately start with Guppy