Tricky but not that difficult.
This is a tricky puzzle, but not that difficult.
This is difficult puzzle, for those who like a bit of a challenge.
This is an extremely difficult puzzle, for those who like to prove a point!
This is a difficult puzzle for those who like a challenge.
This is a very difficult puzzle for those who can think 'outside of the box'
This is a very difficult puzzle, for those who like a challenge.
This is an extremely difficult puzzle. Suitable for those who have to prove a point!
