Android-users, you're in luck because the excellent puzzler Klocki is on sale for the low low price of completely free.
Not only that but Klocki's predecessor, Hook, is also quite cheap at the moment being 50p/50c, down from its usual £1, not the biggest saving in the world but, hey, at least it's something.
Both games are pretty minimalist puzzle games. Klocki has you switch panels around to make a complete pattern, and Hook has you connect lines with a little circle. We really enjoyed both games, Klocki received a Gold Award, while Hook got a Bronze Award. They're great brain teasers which strike a perfect balance between complexity and minimalism.
Folks on Android should not pass up this opportunity to get a great game for free, so you can download Klocki right now and get Hook for pennies on Google Play. For iOS users, Klocki and Hook can also be bought on the App Store for 99p/99c each.