Grim Temple - Stage 1
This will be a quick one. Grab all the items first then use the fire gloves to guide you through the dark. Kill all the enemies, including some rats and several Stalfos to open the door to the gateway.
Grim Temple - Stage 2
Walk along the vanishing platforms so that all three heroes meet in the middle. Kill all the Poes to reveal a new path. Hit the orb to get the nest section. Here we have several Gibdos to be defeated to make the gateway appear. Burn the bandages away with the fire gloves and finish them off.
Grim Temple - Stage 3
Throw heroes onto a matching color platform and use the boomerang until everyone gets to the other side. Here you will face ghost enemies of the gray variety, Defeat them before continuing to another section with more colored platforms. At the end waits an encounter with some Redeads. It will be smart to stay on the moving platform while fighting these things as this is a safe spot and they cannot catch you here. Stun them with your items and finish them off with the sword.
Grim Temple - Stage 4
Prismantus is a simple boss to fight. The first part involves hitting the colored orbs with the correponding colored hero. You'll want to wait until the boss slows its rotation to try and hit the orbs. Hit each orb twice until all three are off to stun the creature. Get a duo totem to slash at the eye to proceed to the next phase. This time Prismantus will be rotating sideways. Simply repeat what you did before until the eye is once again exposed for you to attack. Finally, the third phase is pretty much the same except the boss will be rotating faster and gets a new laser attack. The enemy will be turning in a circle while firing the laser, so move away when this is happening.