Zwirn is an interesting game to say the least. Though first impressions are somewhat similar to Zen Bound, they are unfortunately only skin deep. Zwirn (German for twine) is a quirky puzzle game where players manipulate a piece of string from its starting point, and thread it around the level so it touches all black dots simultaneously by the time you reach the end.
The first four levels are supposed to act as a tutorial, unfortunately they are not of much help. Rather than give you written instructions, you are left to decipher some small pictures.