I am beginning to understand why so many came to hate 3D Dot Game Heroes, the fire temple is the intersection of all things bullshit.
Unlike all the other dungeons where you twist through the corridors unlocking shortcuts along the way via picking up keys to unlock doors so that if you die you aren't back to square one, there is none of that in the fire temple. Spread throughout the temple are red and blue blocks and toggle switches. Hit the switch and the red blocks raise and the blue blocks lower and vice versa. So you have to go back and forth across the temple hitting the toggle switch so you can double back along a new path to another toggle switch to double back on a new path, etc. If you die, you have to run the entire toggle switch gauntlet again.
Also spread throughout are enemies that when you touch them, your HP goes to 1/2 heart and your MP goes to zero, did I mention there are also enemies spread throughout that you can only kill using a spell which costs MP, and they are often in rooms right next to each other? ALSO spread throughout are enemies that are immune from attack from the front which makes fanning out to farm for MP from jars difficult.
Also, enemies spawn in random locations in the room, with the possibility to be right on top of you. There is also a 1/2 a second pause between loading floors. Twice I took the stairs up to the same room and that resulted in the HP and MP sucker touching me. Was 85% of the way through the dungeon (takes about 35 minutes) and I had run out of potions. Now I have to start completely over...