The beauty of a (puzzle) game is not only what we see and hear, but also what we feel when pressing buttons and moving the mouse. Controls are important and I prefer them crispy.
No free software puzzle game has more flavor than Krank. The player piece is a string of circles, which follow the cursor to collide with smaller pieces, which need to be connected to static pieces in different combinations. Unfortunately I fail at recording videos of the game and screenshots can’t communicate the feel of the movement and sounds.. Speaking of movement, the controls are not as sharp as they should be, according to my ideal. However, this seems to fit the game very much, slow music, slow pace, ‘swimming’ controls. At first I was frustrated, because trying to do precise movements quickly leads to disaster (or just a harder time finishing levels than if you would do it slowly) but then I learned to relax.