Make a choice among the Gust Jar, the Fire Gloves and the Gripshot, then give the other weapons to the doppels. Walk on a bit and a key will fall under the sand, caught by a crab. Use the Gust Jar or the flower bombs to make the karat crabs get out, strike them and retrieve the key. If a hero gets caught by a morth (looking like "small eyes"), have another hero strike it. Then go north and unlock the door. Stand on the Triforce gateway to go to the next stage.
Here you have to fight all sorts of enemies. First strike the skullropes (snakes) which are very annoying, then some stalfos and a flying fire keeleon will appear. Use the Gust Jar to stun the stalfos, then slash them quickly once and come back where you are safe. (If you slash them twice in a row, you will sink.) Next, totem up with another hero, blow on the keeleon to blow out the fire, and strike it. When all the enemies are defeated, another group will appear! Again, fight them all so the gate will open. Step on the Triforce symbol to go to the next stage.
As soon as you arrive in this room, you can briefly see slabs disappearing. Actually they are invisible and you can walk on them. Make a three-Link totem and use the Fire Gloves to make these slabs appear temporarily. Walk on gradually, going north and east to the platform, then north up to another one. Get rid or avoid the fire keeleons, then throw more fireballs to go west and step on the moving platform. Head west and north towards the Triforce gateway to go to stage 4.
Get down into the arena to start the fight. Three mummies called gibdos will come near and if they see you, they will run after you. Use the Fire Gloves to remove their bandages and turn them into stalfos, then strike them. Or easier: use the Gust Jar to make them fall down. Good riddance! Next, step on the Triforce symbol, then as always, walk to the chests and choose one to get a new material. Level completed.