Nate, I think the geometric ones from Ms Misawa are similar to what's so called "Dusumoh", a google search will let you easily find more about it.
As for hasher I can assure you Ms Misawa's puzzles are 100% accurate and you must have made a mistake somewhere.
Here's the solution (select the area below with your cursor):
2 9 5 7 6 4 1 3 8
1 6 7 5 8 3 4 2 9
3 8 4 1 2 9 5 6 7
9 3 1 6 5 8 7 4 2
8 7 6 3 4 2 9 1 5
4 5 2 9 7 1 6 8 3
7 2 3 4 1 5 8 9 6
5 4 9 8 3 6 2 7 1
6 1 8 2 9 7 3 5 4
Thanks r.e.s for the trick!