The Android version is free-to-play, just like the iOS version that Hipster Whale released in November, although it is published by Yodo1 Games. It's difficult right now to find Crossy Road on Google Play with a simple search because of all the clones — the genuine article doesn't pop up within the first 50 results for "crossy road," unless you use quotation marks — so you can use this direct link.
In Crossy Road, you use touchscreen swipes to cross roads, train tracks and water, avoiding hazards like cars, trains and the bird that will grab you if you don't keep moving. You can choose from one avatar at the start — a chicken, naturally — and can pick up, earn and buy in-game coins to unlock more than 50 other characters. Once you sign in with your Google Plus account, you can track your and your friends' scores on the Google Play Games leaderboard. For more on Crossy Road, which was one of Polygon's best mobile games of 2014, check out the trailer below and our interview with Hipster Whale.
Correction: Crossy Road launched on Android via the Amazon Appstore on Dec. 13, so today's release on Google Play does not represent the game's Android debut. We've edited the story to reflect this.
The Amazon Appstore is Amazon's own marketplace for Android, Kindle Fire and Fire Phone apps. It does seem that the Google Play version of Crossy Road is compatible with a wider range of Android devices — the Amazon Appstore version doesn't work with our Samsung Galaxy S4, for example.