Ustwo's playable optical illusion Monument Valley is now available for Android devices, following up on a successful launch last month in the iTunes App Store.

Monument Valley challenges players to explore fantasy worlds filled with unlikely architecture, sussing out illusory patterns as they solve puzzles and traverse tricky level geometry. Developer Ustwo recently revealed that the game earned over 500,000 downloads following its iOS debut in April.

Monument Valley is priced at $3.99.

[Image: Ustwo]

This article was originally published on Joystiq.