Enjoy this twist on a classic numbers puzzle.
Of course there's solvers, so this could be quite challenging, or quite easy.
If you don't know about the solvers that make this easier, make sure to ask at the next geocaching event you attend!
D3,D5,C2,B8,I5,F5
H4,H8,B9,G2,D2,D3
E2,D3,F4,H7,B9,H7