I've finished the game in Jap version and I know what your talking about i think... you have to follow the guide book or guides on the net because it's very hard if you get the combination right, no monster comes up.
I've got it wrong before and he's bound to kill you if you get it wrong, so go look up guides on the net

If you get the puzzles right, then no monster will come up. It's very hard to follow but your near the end.

Good luck