Helheim [20]

Swim down, dealing with sharks if desired. Thor's Hammer is effective.

Locate the large statues. Swim to the far left one and find Treasure 1 in a hole on top.

Proceed to a lever; it cannot be activated yet. Go left to find carved stones. Pick up a nearby Power Stone and slot it into one of the carved rocks.

Swim down and left to find stairs. At the base, go right for Treasure 2.

At the top of the stairs, enter the doorway. Swim right and collect Treasure 3 on the rocks.

Swim left and up to find a tunnel leading to another Power Stone. Treasure 4 is to the left of this Power Stone.

As you swim back, before heading down, look for a tunnel upwards. Treasure 5 is on the rocks to the right of this tunnel. Treasure 6 is opposite Treasure 5.

Return to the entrance and swim up to surface. Climb out, stand on the small rock, and ascend ledges. Climb up, jump left onto a beam, climb up to a ladder, and jump to the platform behind you. Pick up another Power Stone. Treasure 7 is in a jar to the right of this Power Stone.

Return outside and place a Power Stone into the other carved stone. To the right of the lever are two more carved stones; place another Power Stone into one of them. Treasure 8 is behind these carved rocks.

Swim right and down to find another doorway. Swim down and head right to the side of the temple to find Treasure 9 on the floor.

Enter the doorway and swim up to surface. Climb out. Treasure 10 is in a jar beside where you climb out.

Climb the ladder, go right onto the ledge, climb up, and jump right. Climb up and jump to a beam, traverse it, jump to a ladder, climb up, and jump off. Go up another ladder and jump to a beam, then to the next. Climb up to collect the final Power Stone. Treasure 11 is to the right of this Power Stone. Treasure 12 is on a ledge to the left, opposite the Power Stone.

Climb back down and head outside to place the Power Stone.