Count
1 - 4 of 9 used
2 - 3 of 9 used
3 - 3 of 9 used
4 - 2 of 9 used
5 - 1 of 9 used
6 - 2 of 9 used
7 - 3 of 9 used
8 - 3 of 9 used
9 - 3 of 9 used
Completed:

There are 57 squares remaining.



BLACK: Starting / initial numbers.
BLUE: Correct figures entered by user.

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USAGE HELP:
When using the select boxes, you'll see a range of numers, T(1-9) and R(1-9).
If you want to add a 'pencil' mark - of a test number, select a number in the "T" range.
When you have decided a number HAS to go into a box - for real, select a number in the R(1-9) range.
To take a number out - just select it again (eg T-4), and click refresh.

(updated 12 Apr 2020).