Still haven’t been able to get past Floor 5 (those wizards really suck!!!!), but I’m comfortable enough with all floors previous that I’ll drop everything I know for anyone who wants some guidance (again, playing on MAME – I have no idea what little nuances may change outside of the arcade):
Tip: Play like it’s Dragon Quest
Details: The treasure spawns after defeating three slimes. Since the movement speed is still so slow, I don’t bother with any slimes beyond the mandatory ones to get the chest, then book it to the door. Inside of the chest is a pickaxe, which I have not found a use for yet.
Tip: Don’t be afraid of the dark
Details: This floor introduces three black slimes, but the treasure only requires defeating two in order to spawn. I can’t tell any difference between the behaviors of the black slimes versus the green ones. This chest contains the boots which is such a significant upgrade to movement speed that I consider this an absolutely necessary item to obtain.
Tip: Et tu, Brute?
Details: The knights on this floor only take damage when attacked from behind. Walking through them with the sword drawn and then immediately doubling back will always kill them – similar to the black slimes on the previous floor, there are two knights on this floor but only one must be defeated for the chest to appear. This chest contains a potion which acts as an extra life.
Tip: Knock, knock
Details: Stepping over the closed door without having obtained the key will cause the treasure chest to appear. This chest contains a bell, which like the pickaxe I have not yet found a use for. This floor taught me not to always pick up keys right away; not just for the treasure puzzles, but also because the maze can be arranged in ways that places the treasure beyond the door. The time limit makes it annoying, but I’ve generally found it more convenient to meet the treasure requirements before picking up that floor’s key to ensure you’ll be able to collect the item.