Minikit Guide - Chapter 7 - Lego Batman 2: DC Super Heroes
Required Characters: Lex Luthor, Superman
In the second checkpoint after escaping the crumbling cavern, use Superman and fly to the right. You should see a golden object in a platform. Destroy it to easily get the mini-kit inside.
There are three large Joker Cards that you must destroy to get the mini-kit. The first one is found to the right after freezing the waterfall. The second one is found by destroying the silver block above Robin's Magnet Suit capsule. The third one is found inside the room with the golden device.
Find a way to assemble the gyro ball mechanism and operate it using Robin's Acrobat Suit. Wait for the t-rex robot to stop and lay a golden egg. Disintegrate it using Superman's heat ray to get the mini-kit.
As soon as the level starts, deconstruct the black blocks in the computer to get the minikit.
There are three floating Joker Boxes that will appear once you ride each of Batman's vehicles which you'll use to shoot Lex and Joker. Destroy these boxes to get the minikit.
Head to the right and put out the fire near by the Batman logo to the lower left.
Shatter the large glass then change to Robin's Acrobat Suit. Melt the gold plate underneath to get the minikit.
Next fly to the left to find a hanging platform above the Batwing, containing a minikit
After reaching the large, open space with a T-Rex robot, deconstruct the black door to the left then shatter the glass enclosure to get the minikit.
Before leaving the area past the T-Rex robot, destroy the debris covering a Riddler Box. Switch to the Riddler to open it and get the minikit.