Click each hint to reveal it. Try the earlier hints before looking at later ones!
First, you need to get past the "Baba is You" without breaking it up. How will you do that? Why does the game end if you break the rule?
Walk Baba onto a patch of Lava. What happens to him? Now push the Rock onto any patch of Lava. What happens now? Are there any inferences that can be made about both "Hot" and "Melt"? How are "Hot" and "Melt" related?
It looks like three pieces of text can be freely moved around. Can those pieces of text form a rule?