Instructions
Avoid the traps as much as possible and focus on closing and defeating Humphrey. Of the three enemies, Humphrey is the one who deals the most damage directly from the beginning. He will also summon two Rag Zombies periodically.
ignore the smaller monsters as much as possible and concentrate your attacks first on Humphrey, then on Dingo, and finally on Marv.
Spam your strongest attacks as often as possible. The three elite enemies will summon more enemies periodically, so you must kill them quickly to avoid being overwhelmed.
Jump just before Humphrey uses his "slam" attack to avoid taking damage.
Do not stop attacking. Humphrey and Dingo both have high HP regen skills that will kick in if you allow them breathing room. Concentrate on killing one, then switch to the second.
Summon monsters of your own if you have the ability. Extra help will come in very handy against the myriad enemies you will face on this floor.
Do not try to attack Dingo from a distance, as he will guard against your attacks. Instead, walk up to him and grab him to remove his guard, then wail on him while he is knocked down.