ORIGINAL NUMBER CROSSWORDS
Two sums.
One certain digit.
Follow the clues across and down. Find the digit that makes both sides fall into place.
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A COLLECTION WORTH THINKING THROUGH
A larger grid.
A deeper thought.
120 original boards in five volumes, each checked for one solution. The first four volumes open immediately. Eight different clears earn the 11×11 Grand crossings.
Underlined starter digits are printed anchors. They belong to both crossing sums; your task is to discover every remaining digit.
Actual iPad gameplay shown. The right side holds crossing combinations, notes and the keypad.
Think with a pencil.
Keep candidate digits, erase, Undo or Redo. Read combinations for either crossing, or practise a sum in the Combination lab.
Ask for a reason.
Hints explain a narrowed digit or label a checked search continuation. Checks and computed notes mark an assisted attempt. A local check does not promise a complete future solution.
Keep your thought.
Boards save on this device. Keep the last 80 actual clears and entry history, and share a named JSON record. Today's crossing selects an included board by UTC date.