#18:
CGHVEFNCOS VG RTEEVEU GAMRY
SECOND HINT:
The Room of Love holds the best ending.
#17:
Right at the very beginning of this game, you can start a combat you're not supposed to do (since it is hard to do it underleveled, and by the time you've gained exp this combat is no longer here), which, given that you win, the foe in particular would mock you by saying "I thought you were supposed to be a good guy!"
SECOND HINT:
Paper...