This app was mentioned in 4 comments, with an average of 18.50 upvotes
Hitman Go. Tons of playable content.
Also, 2048. Bound to solve it playing straight for 4 months. BTW, this is the best version I have found: https://play.google.com/store/apps/details?id=com.alexjlockwood.twentyfortyeight&hl=en
Also, Chrooma. It's totally free now and a great game for the Material world.
Edit: More reccos
There are a ton of 2048 games on Google Play, IMO this is the best version:
https://play.google.com/store/apps/details?id=com.alexjlockwood.twentyfortyeight
This also has some alternative game modes once you get bored with the basic game.
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Do check them out.
Edit: Spelling and grammar corrections.