The Puzzle Loft

Play on the web • Books on Amazon • Local progress

Flipudoku

Sudoku with a memory twist. Cells marked with F can be flipped to briefly reveal their number. Use logic, remember what you’ve seen, and finish the grid with limited hints and errors.

How to play

F-cells can be flipped to show their hidden number. Empty cells must be filled using the number pad. Wrong inputs count as errors (max 3). When all 9 copies of a digit are correct, or when a whole row, column or 3×3 box is complete, those cells become fully visible with a dark green glow – no more F, just the solved numbers.

Difficulty & flip limit:
Hints left: 3 Errors: 0 / 3
Select an empty cell, then choose a number:
This demo uses a fixed solved Sudoku in the background. Each difficulty adjusts how much can be flipped at the same time and how much information you can see. Hints reveal correct values in non-given cells. No accounts, no cloud save; everything stays on this device.