Minikit #1: Turn around at the start of the level to find a glowing handle. Use the Uruk-hai to pull away the block, and drop into a secret area.
Hope on the rope in the northern part of the area to lower a platform.
Now hop up on the ledge near the platform with Legolas and cross over to where the minikit is resting.
Minikit #2: In the same secret area, a mole will be popping out of his various burrows. Use Legolas to shoot a target on the stalactite in the southeast. This will plug up one of the mole’s holes.
Use Sam’s tinderbox to burn away the growth on a stalactite in the southwest part of the room. This will plug another mole hole.
On the same platform where you found Minikit #1, use Gimli to smash a broken tile, plugging a third mole hole.
With all holes plugged, enter the dark cave using Frodo’s Glowing Phial to scare the mole. He’ll pop out of one last burrow, releasing a minikit.
Minikit #3: Just before the tree with the destructible door, you can walk behind this tree to find a minikit.
Minikit #4: When you reach the first stream, there will be a minikit encased in Mithril. Use the Berserker’s bombs to destroy the Mithril and claim your prize.
Minikit #5: During the duel with Sarumon, throw him into the stained glass door with the lock. This will cause a bird to fly through the shattered glass and drop off another minikit.