CAGE LAB
Arithmetic combination explorer
Study distinct-digit sets for any board size, cage length and target. Mystery players can compare which operations remain possible.
Set a board size, cage length and target.
CALCUDOKU · DAILY + UNLIMITED
Calcudoku
Fill each row and column once, then satisfy every arithmetic cage. Pick a board, tap a cell, and solve.
Time0:00
Games0Clean0Daily streak0Best—
SOLVED
Calcudoku complete
—
Select a cell and enter a digit. Each row and column uses 1 through the board size exactly once.
Keyboard: arrows move · digits enter · N notes · Backspace/Delete erase · ⌘/Ctrl+Z undo · Shift+⌘/Ctrl+Z redo.
Strategy & exact reviewOptional · candidates, cage lab, local evidence
V0.185 · CONSTRAINT-ONLY COACH
CleanExplain the board, not the answer key
Every candidate and proof is recomputed from your current row, column and cage constraints. Using Explain or the candidate map marks this solve Assisted.
Empty—Forced—Avg candidates—Contradictions—No-Op forced—Last moveNo move yet
Ready to reasonChoose Explain next step for one proof, or inspect a cage without revealing the stored solution.
Enter a digit to receive a constraint-only move review.
LOCAL EVIDENCE
Your recent practice
Daily evidence and V0.185 clean/assisted history stay only in this browser.
Last 7 days0/7Last 30 days0/30Daily streak0Coach uses0
No V0.185 finishes yet
LATIN-SQUARE RULEEvery row and column uses each digit once
On a 5×5 puzzle, every row and column contains 1, 2, 3, 4 and 5 exactly once. There are no 3×3 Sudoku boxes.
ARITHMETIC CAGESUse sums, products, differences and quotients
A clue such as 6× means the cage values multiply to 6. Two-cell subtraction and division cages can work in either order.
EXPERT 7×7Verified larger-board practice
Expert uses a separate V0.185 7×7 bank. Every source and all eight symmetry transforms were independently checked for one solution.
MYSTERY NO-OPWork out the operation too
Mystery hides +, ×, − and ÷ signs. Its 6×6 source pool was independently re-solved with operations unknown, so every transform still has one solution.