Buttons

Type in the fixed numbers - from the newspaper or wherever - and then click 'start'.

Once start is clicked then the 'Start' button will become 'Run'.

Click 'Run' each time the routine stops.

'Start Again' will clear all but thge fixed numbers.

'Recover' will put in the fixed numbers if you want to try again after shutting the routine

'Clear all' will start again from scratch

Colours

This is a warning of an error

This is a warning of an error on a 'Locked Box'

This is a 'Locked Box' the value was typed in before clicking 'Start'

This is an indication of the possible values in the box above.

This is a box that has not been populated yet.

This is a box that has been calculated.

This is a box that has been entered by hand.

This is a box that has been guessed.

(Debugging)