Mathrax: free puzzle app game

Mathrax is very similar to KenKen. The object is to form a Latin Square: each row will have every number once. Same for the columns.

Look at the circle that says 5+ in the first diagram. means that squares which are diagonal will add up to that number.  So, in that little 2x2 square will be 4&1 on one diagonal and 3 & 2 on the other.

Look at the second diagram at the top left corner.  The zero is really the letter O. Which means that all 4 numbers will be odd.

Recently I reviewed another game from Stanley Lam: Ripple Effect.  Both of these are rock solid puzzle apps.