KNOX Puzzles |
Those puzzles are available in Switzerland from

| Rating | Beginner | Amateur | Professional | |
|---|---|---|---|---|
| 1 | very easy | you can do it | ideal warm-up | try it after 5 beer |
| 2 | easy | moderate | easy | that's better |
| 3 | moderate | difficult | moderate | easy |
| 4 | difficult | oops | difficult | moderate |
| 5 | very difficult | art object | how on earth.. | ultimate challenge |