The game is now listed on Google Play and you can pre-register to be notified when it launches (Ustwo hasn’t announced a release date yet). The original Monument Valley costs about $4 in the store, so expect to see a similar price (if not a bit higher) for the sequel when it’s out.
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In case you haven’t tried it before, I highly recommend Monument Valley for its beautiful art style and clever puzzles full of Escher-inspired spaces to keep you engrossed for a couple of hours. It’s hard to believe the game is already three years old, as it hardly shows its age.