Play Hyper Sudoku Online

Hyper Sudoku adds four extra three by three regions to the familiar nine boxes. Each shaded zone must hold the digits 1 through 9 exactly once. The overlap creates early eliminations: placing a number in a shaded region rules it out in the rest of that zone, even across an ordinary box boundary.

1. Read the given digits; these dark numbers stay fixed.
2. Select an empty square and use the number buttons to enter a candidate from 1 to 9.
3. Put each digit exactly once in every row and column.
4. Put each digit once in every standard three by three box.
5. Each of the four shaded three by three regions, starting at row 2 or 6 and column 2 or 6, also contains 1 through 9 once.
6. Use Clear to erase an editable cell. Complete the board and check the variant rules to win.
7. The four amber zones overlap ordinary Sudoku boxes, but they are separate nine-cell groups. Their upper-left corners sit at rows 2 and 6, columns 2 and 6, counting from one. A number placed inside an amber zone excludes that digit from every other cell in that zone, including cells outside its standard box.
8. The extra shaded boxes begin one cell down and one cell right from each corner standard box. Their overlap with ordinary boxes creates eliminations that ordinary Sudoku cannot see. After solving a digit in a shaded zone, cross it off all eight remaining positions of that zone. Then check its row and column again, since that single placement may force a second number.

• Every row contains the digits 1 through 9 once.
• Every column contains the digits 1 through 9 once.
• Every standard three by three box contains 1 through 9 once.
• Each of the four shaded three by three regions, starting at row 2 or 6 and column 2 or 6, also contains 1 through 9 once.
• Ordinary boxes remain active. Each cell in a shaded zone participates in its row, column, standard box and extra shaded box. A legal candidate must satisfy all four sets at once. Do not treat the amber region as decorative background; a grid that solves ordinary Sudoku can still violate a shaded zone.

• Start with rows that have several given digits and list their missing values.
• Scan one shaded zone as an extra box. A candidate excluded by the shaded zone may still look legal in its ordinary box.
• Check columns crossing a marked constraint before placing a digit.
• When a region has just one empty cell, fill its missing value and revisit the variant clue.
• A complete standard Sudoku grid can still fail a variant rule. Review every marked constraint before the final move.

• Sudoku: Practice the standard number-placement rules before trying a variant.
• Jigsaw Sudoku: Compare how a related puzzle uses regions, paths or tile placement.
• Thermo Sudoku: Compare how a related puzzle uses regions, paths or tile placement.

• Each extra constraint adds a second way to narrow candidates.
• The number pad works with touch, mouse and keyboard focus.
• The variant rules reward scanning more than one region at a time.
• Hyper Sudoku extends familiar scanning rather than changing the number pad. Start with an extra region that holds several given digits, list what it lacks and cross those possibilities with row and column exclusions. The strongest deductions often appear near the four corners of the central standard box where extra zones approach it.

Play Hyper Sudoku free in your browser. Start the interactive board above, use its on-screen controls and check the rules below when a deduction gets stuck. No download or account is needed.

Try another round of Hyper Sudoku on the board above. Start with the most constrained part of the grid, test each move against the stated rules, and use the reset control to try a new approach.

• Variant Sudoku reference