TRIM±
Every entry is added + by default. Write exactly one per row and per column in red ink − so every line of the ledger balances.
How to play
- Every entry starts + added. Tap it to mark it − in red ink (a deduction); tap again to restore it.
- Balance the books by marking exactly one entry per row and column in red ink (−), leaving the rest added.
- Each line's total earns the bookkeeper's double rule when it balances, shows amber while the sum runs over, and red ink while it runs under.
- Every daily ledger has exactly one balance — pure deduction.