Originally Posted by darkboy1200
I got all the decals and still have no lights. Should I just restart episode 5?
Make sure you have all 20 decals (press A on the boot/trunk of the DeSoto) and all 4 MYSTERY UPGRADES. If not, replay the mini-games until they are all there!
When happy, load up Episode 5 (if not already in Episode 5).
Speak to The C.O.P.S. (in the garage).
Ask to play their game again.
Quit out of the rat-splat mini-game.
You will get your UBER MYSTERY UPGRADE and achievement.