All merges:
Skull cube + RGB cube = lighthing skull cube
Lighthing skull cube + electricial dust = lighthing dust
Click green cube 15 times = big green cube
Big green cube + skull cube = big skull cube
Click skull cube 15 times = big skull cube
Click red cube 15 times = big red cube
Click brown cube 15 times = big brown cube
Click RGB cube 15 times = big PB cube