Forest Temple - Stage 1
Go right ahead and have everyone grab something, then take your archer and position him beside the lit torch that is directly next to the unlit one, then fire an arrow. Next, stack your three guys and do the same for the high torch next to the door to light it so you can proceed to the next section. Here, you need to throw bombs into the round slots at the center of the traps to destroy them.
Forest Temple - Stage 2
In the room is a big platform that must be stepped on by three people to summon the monster horde. This group will include a few Tektites and some spinning trap enemies. Rush up to higher ground using the stairs in the area and throw bombs into the center of the traps. Use arrows to kill the Tektites with a totem of two, or you can also use the sword if the spinning traps are gone.
Forest Temple - Stage 3
This stage involves a lot of running as there is no way to destroy these traps. Stack all your characters then run from the arrows until you encounter a block. Blast this with a bomb and keep going to the next piece of block while still keeping an eye out for projectiles. Destroy this brick with another bomb then send an archer to dash to the corner and light the torch. Continue weaving through the rest of the way until you spot a block that you can push to finally stop the arrow traps.
Forest Temple - Stage 4
This boss level comes in three parts: the first two involves baiting the enemy to go into offense mode by moving in close to it. Once its attack ends, the hatch on top of the wheel opens, allowing you to throw a bomb in. This will expose the eye which you can then damage with more bombs. You need a totem of two characters to reach the hatch by the way. The second part is basically the same except you'll need a totem of three to reach the hatch and the eye. For the final part, the eye will fall out and just bounce around the area. At this point, you're better off chasing it down and attacking with your melee weapon until it gives up and explodes. Continue on to the gateway now.