Fire Temple - Stage 1
Everyone should each grab an item then put two characters at the edge of the platform, and use the gust jar behind them to blow them across over the pit to the north. Retrieve the last hero with the boomerang afterward. Next, dodge the spinning fires and step on the three switches to open the gate leading to the next section. Here, take your archer hero and shoot arrows at each of the three orbs within the time limit, to activate the gateway. The platforms sink if you stay on too long.
Fire Temple - Stage 2
Here we have a battle against three Hinox riding in mine carts. They will throw bombs at you like before, but instead of throwing them back, you can use the boomerang to grab the bombs from the pillars, wait on one of the balconies and throw the bomb once the Hinox passes by. It takes about 3-4 hits to defeat one. After the first is defeated, two more will appear.Repeat what you did to their friend until they both die too. The gateway will appear after you successfully take care of the three.
Fire Temple - Stage 3
In this stage is a big block that a standard hero can move. The treasure chests here has some hearts and rupees. Anyway, move the block over the lava spot that is farthest to the right then throw two people up onto it. With a duo totem, shoot an arrow or throw a boomerang at the orb when the lava lifts the block. Kill the two Hardhat Beetles and step on the gateway to move on.
Fire Temple - Stage 4
Now for the battle against Moldorm. As with most bosses, this one also follows the human-controlled character, so keep this in mind as you switch to a different hero to attack the creature's tail. With enough hits, the boss will lift its tail which means you need to stack a pair of heroes to reach it. Again, use the remaining character to lure Moldorm so your duo totem can have a clear shot at its weak spot. For the last bit, you'll need a full totem which means you can't trick your opponent anymore. Go around and try to get a view of the tail and continue hitting it until the boss is defeated. Keep an eye out for the lava rising up from below too. Go step on the gateway afterward.