Good puzzle games are a balancing act – at least for me. Difficult enough for a challenge, but not so hard you throw in the towel at level two. NetBots is precisely this.

The concept is simple, you have to connect the dots, form different Tetris-style shapes that fit in a particular space. Sometimes it's easy, and sometimes it takes you a try or five. The first few levels you'll zip through with ease, but there's a subtle challenge to puzzles like this that I find positively addicting.