Fill the grid up with chips, of value 5, 10 or 25, so that the side totals are all accurate.

You can Print out a sheet of puzzles or alternatively, Play in your Browser.

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What I Didn't Do

This is quite a hard game, and I usually need about 3 or 4 attempts at a puzzle before I can solve it. Erasers at the ready, for this one!
I'm not convinced that making it easier would make it better.
Let me know what you think.