Cash can be used to buy amazing power-ups such as Hint, Auto-Pencil and Extra Time.
- Hint solves one random empty cell.
- Auto-Pencil fills all empty cells with all possible allowed values.
- Extra Times gives you additional time to complete a level.
Hint and Auto-Pencil can be purchased by tapping on their icons (Hint - Light Bulb and Auto-Pencil - Pencil with a star) in the puzzle screen.
Extra Time can be bought when allotted time for a level is over.