Most ppl know what this is, right?
_ _ _ _ _ _ _ _ _
|6|_|_|_|_|_|_|_|1|
|_|_|8|_|7|_|4|_|_|
|5|9|7|4|6|_|8|_|2|
|_|_|_|_|_|5|_|_|4|
|_|_|_|_|8|_|_|_|_|
|_|8|_|_|_|2|1|_|7|
|4|2|1|7|5|_|_|6|_|
|_|7|_|_|3|4|_|1|5|
|9|_|5|_|_|_|_|_|_|
i was wondering who else liked those puzzels...