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 |