You know Halloween is around the corner when you see dark themed games like this one. Gamesfree's creations never fail to amaze me specially when it comes to their platformers where animation and environment works together really well. The only downside is you have to play it on high performing computer for you to enjoy it in maximum settings. Otherwise, you will experience a lot of lags that will probably put you off.
Anyways, I listed here a couple of cheat codes that works in the game:
During the game, type in MONEY to get souls.
Type in BOSS to get to the final boss.
I also put up a video of me demonstrating Jacko In Hell 2 cheats just so you have an idea where to put them and how they work.