Use 1–4 once per row and column while satisfying arithmetic cages. A unique-solution 4×4 CalcuDoku with daily boards, notes and explained hints.
Daily puzzles change at midnight UTC. Practice creates a fresh set.
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Place 1–4 exactly once in each row and column. There are no Sudoku boxes.
Each outlined cage has a target and operation: add or multiply all its digits; subtract or divide the larger by the smaller in two-cell cages.
A clue without an operator gives its single digit. Repeats in a cage are allowed only in different rows and columns.
Select a square and use the keypad or keyboard. Notes, erase, undo, checking and explained one-step hints help you finish.
CalcuDoku combines a 4×4 Latin-square rule with connected arithmetic cages of one to three cells. Values are 1–4. Subtraction and division cages contain exactly two cells and use the larger value first; division is exact. Every generated board has one solution and a full sequence of candidate deductions. Daily entries and notes resume locally; Practice offers fresh untimed boards.
A completed board saves requested hints; fewer is better. Notes, checking, erase and undo are free; undoing a hinted entry does not remove its hint. Different cages may have different difficulty. Completed daily drafts do not record another result on refresh.
More about your scores →A two-cell 2÷ cage in a 1–4 grid can contain 2 and 1, or 4 and 2, in either order. If one square’s row already has 1 and 2, that square must be 4 and its partner must be 2.
A cage total alone may allow several combinations. Rule out a combination when it repeats a digit in a row or column. Repeated cage values remain possible if their squares are in different rows and columns.
A 6+ clue spanning three cells uses all three digits. A 3− or 2÷ clue always uses exactly two cells. Heavy outlines show cage edges; thin or absent interior edges keep its squares connected.
Start with single-cell cages, then inspect differences or division clues.
List combinations making a cage target, then remove digits already used in its rows and columns.
Addition and multiplication cages can span three cells. Use all of them, not only a pair.
Results describe this game session. They are not IQ scores, diagnoses or clinical assessments.
No. Use the larger value first in two-cell subtraction and division cages. A 2÷ cage may contain 4 and 2 in either order.
Yes, when they occupy different rows and columns. Row and column uniqueness always applies.
It shares the row and column rule but has arithmetic cages instead of Sudoku boxes.
Only a one-cell cage without an operator specifies its digit. Larger cage labels specify a target, not a digit to enter.
The generator checks that a full sequence of single-candidate or single-position deductions can complete every starting board. Hints explain one such step.
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