## Logic number puzzle: Sumdoku (Sumdoku).

Description: Puzzle game with numbers to be placed onto a grid. The rules of Sumdoku are as follows:

1. In each field of the NxN grid, write numbers from 1 to N.

2. In each row and each column (and if selected, in each diagonal), each number must be written exactly once.

3. The sum of the numbers in each area must equal the number given for this area.

The game is a typical logic game: In order to find the correct solution of the puzzle, you have to explore the sum values, and by logical thinking
(concluding from what you know, that a given field must be a given number, or on the contrary, can't be a given number), determine, to which fields
which numbers have to be written.

The game is played exclusively with the mouse: Click the field, where you want to write a number, then click one of the number buttons to write the
corresponding number or "Clear" to remove the number from the actually selected field.

Note: The "unique numbers on diagonals" rule is not implemented in "Sumdoku" version 1.0.

Free Pascal features: Changing the color of shapes and the caption of static-texts and labels during execution. Creating
objects during runtime. Two-dimensional arrays and array indexed by array elements (classic Pascal).

Screenshot: