Sixfold Ledger

Sum Ledger: Horizontal pairs carry account totals. Fewer fixed digits shift deduction toward combinations inside each two-cell cage.

Select a blank, then a digit. Fill every row, column and lettered region without repeats. Pencil marks support deduction; Check evaluates constraints.

Tap or click the controls. Keyboard: Tab and Enter/Space operate every button; arrows/WASD move where available, R restarts, Z undoes calm puzzles.

Mistakes remain revisable. Unlimited undo and restart recover deadlocks.