## Logic number puzzle: Kakkuru (Kakkuru).

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

1. In the white grid fields, write numbers from 1 to N (N = number of white fields in a row/column).

2. In each row and each column, each number must be written exactly once.

3. The numbers in the black fields are the sums of the numbers in the white neighbour-fields.

The game is a typical logic game: In order to find the correct solution of the puzzle, you have to explore the sums given and numbers already writtem, 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, which fields have to
contain which numbers.

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.

Change log:

Version 1.0 (August 2020): Original program

Version 1.1 (September 2020): Bug fix

- application abortion with "Clear all" button fixed.

Free Pascal features: Changing the color of shapes and the caption of static-texts during execution. Using buttons to insert characters
into a given control's caption. Two-dimensional arrays (classic Pascal).

Screenshot: