I remember seeing a game previewed a few years ago in G4 (probably X-Play). It was a puzzle game and I believe it was from one of the developers of Portal. The premise was you could solve puzzles by changing the material things were made out of. You could make things hard so you could climb on them or soft so they were mushy. It looked interesting at the time and recently I replayed Portal which made me think of it again. Does this ring a bell with anyone? Thanks.
Quantum Conundrum, probably.
That’s it! Thank you!