How much does it cost? Looks like fun.
Like you, I do a lot of sudoku.
Also I have been having a ball with the "Professor Layton" video game series, which involves a variety of brain teasers throughout, that must be solved in order to proceed with the plot of each game. Some easy, some quite challenging, and some tricky.. but all are fun and helpful.
"You can never cross the ocean until you have the courage to lose sight of the shore." - - - C. Columbus