In reply to The Lemming:
Liked the visuals of Monument Valley but found it quite easy... same as Hook.
Limbo is amazing- worth whatever price it's currently going for.
Enjoying Space Marshalls at the moment, for some asymmetrical sneaky/shooty fun.
Also recommend downloading ScummVM and then getting various ROMs for things like Day of the Tentacle, Loom, Space Quests, Broken Sword etc.