CalcuDoku tips

General

• Start with the small blocks and then move to the larger ones.
• Make small pencilmarks noting which numbers are allowed in the empty squares. This will help narrow down possibilities later on.
• Always double check before placing a number.
• Never guess! Only make moves based on logical deductions.

Note: There is only one unique solution for each puzzle.

When solving on paper

• Use a soft erasable pencil and a high quality eraser.

When playing on a computer

• Use Preferences options in toolbar for a better personal playing experience.
• Use pencilmarks to note which numbers are allowed in the empty squares. This will help narrow down possibilities later on.
• For faster solving, numbers can be placed by pointing mouse on the desired square and then typing with the keyboard.