"The Four Thwomp Bosses are too hard!"

Try to not rely in the hardest strat: spinriding on them. 
There's a very high chance you'll end killing the soccer balls
and end annoyed as result. Not my problem.

"Where are the other two exits and the extra content?"

- Refer to haiku 01 and 02 in Chateau Oldenwing;

The rest is up for you to figure out. Good luck; :)

P.S.: I'll eventually make a walkthrough of the hack in my Youtube channel. Please be patient, thanks.

Have fun!
