**Template overview**

NB. 1 - The only zones accessible to the user for data entry are the" Work Area" and "Data Entry" tables

2 - There are hidden cells in rows 50 to 150 with intermediate results not useful to the user.l

**Expl****anation
of the tables:**

**Work Area**

The solution will be built in that table, adding new digits one at the time.

**Global Performance**

The displayed numbers are the sums of the corresponding cells in the nine Integer Performance Tables. They vary from 0 to a theoretical 9.

**Impossibility
Warning**

XXX is displayed in a cell with a global performance valued 0 and in which no digit has been assigned. In such case, it would be impossible to complete the grid.

**Data Entry**

The Su Doku "problem" is transcribed into that area

**Integer Performance Tables.**

There is an area for each digit 1 to 9. It is composed of a 9*9 individual cell performance table, a column of row totals, a row of column totals and a small 3*3 table containing the sums of the square groups..

An individual cell contains 0 if the integer cannot be placed in it (e.g. another integer is assigned to it) or 1 if it can be assigned to the it The sums of rows, columns and groups are the simple count of the ones present in the corresponding element.