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that sure is sudoku. i can't figure out why people find this game fun, and i LOVE number and logic puzzles. it's just too easy and repetitive. in any case, it would be nice if short notes would be visible without clicking the cell (tiny numbers, for instance.) then folks would gripe about the tiny numbers' sizes but at least you wouldn't have to click around to find the info.
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Ran into an issue with level 3. I solved the puzzle, but it didn't register. Thought I may have an error, but had the "show errors" checked and none was detected. With it still checked, I deliberately put an error into the puzzle, but it wasn't detected. 3/5