Whale Trail Classic, the superior premium casual game from Monument Valley developer ustwo, is currently half-price on Google Play.

Released all the way back in 2011, Whale Trail Classic is an innovative, exuberant casual game in which you have to keep a flying whale in the air for as long as you. This involves holding a finger down on the screen to make the whale soar. 

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Other than being highly polished and playable, Whale Trail was notable at the time for its soundtrack, which was provided by Gruff Rhys of Super Furry Animals.

Whale Trail Classic had a bumpy ride in its first couple of years, culminating in an unpopular decision by ustwo to make it free-to-play.

Thankfully that error has been rectified, and you can pick up this classic slice of casual gaming history for just $1.99.