Adventure Level 3: Rathtar Hunting - Rathtar Caverns
Most of the minikits here are only accessible in Free Play mode, so I hope you like hunting Rathtars.
Minikit #1 - Free Play Mode
To the left of the cave entrance are some agility bars.
Use them to swing over to the platform on the opposite side and grapple the Lego plug.
Reassemble the minikit from the parts.
Minikit #2 - Free Play Mode
Use the dark force on the lego bricks to the right of the cave entrance.
The minikit is behind them.
Minikit #3 - Free Play Mode
You need to use the force on five flowers inside the cave. The first is right by the entrance.
The second is a little further in.
As you round the corner, you'll see the next three.
Minikit #4 - Free Play Mode
After scaling the stud wall next to the waterfall, destroy the plants to the right.
Switch to a small character and nip through the hatch.
The minikit is on the other side.
As you progress, you'll reach a pile of what appears to be cupcakes.
Reassemble them on the right and the Lego spiders will pour out of their hole and make handholds for you.
Climb up to find the minikit.
Minikit #6 - Free Play Mode
At the top of the cavern is a pool for Ackbar.
Have him jump in and he'll pop back out with the minikit.