The games and puzzles have a wide range of difficulty. To help customers find the right level of difficulty we have evolved a grading system. The more dots the more difficult, with the following guidelines:
| Games and puzzles for children from 5 years old | |
| Games and puzzles for older children and adults | |
| Harder puzzles for enthusiasts and masochists | |
.The system is only approximate as what one person finds difficult someone else will find quite straightforward.