After a puzzle game to relax with this weekend? You should go and check out B.i.t.Lock. Not only is it free and good but it also just got a huge free upgrade too.
B.i.t.Lock has you pushing around blocks however the classic idea was spiced-up with how you change the entire shape. Pushing parts of the block into an object with shift one part of it around, so you need to use clever positioning on the grid to get into the correct shape and position. Simple idea but brilliantly executed.
With the new "Challenge Pack" update it adds a total of 150 new levels, so there's now 226 puzzles to complete through the game. The developer said it took a year to create this update and they should all be "unique and interesting" with no two challenges feeling the same.
The update also adds a new music track, new achievements and a few minor gameplay adjustments.
Find B.i.t.Lock free on Steam.