Number Fog - online puzzle game

overview

Number Fog is a logic deduction puzzle inspired by Minesweeper. Instead of mines, cells hide numbers. Clue cells display the sum of all adjacent hidden numbers. Use logic to deduce every hidden value.

rules

• The grid contains fog cells (hidden numbers) and clue cells (visible sums).
• Each clue shows the sum of hidden numbers in all 8 adjacent cells.
• Hidden numbers range from 1 to the max value for the difficulty level.
• Every puzzle has exactly one unique solution.
• Fill in all fog cells correctly to win.

controls

• Click/tap a fog cell to select it (highlighted border).
• Use the on-screen number pad or keyboard (1-9) to enter a number.
• Press 0, Backspace, or Delete to erase a placed number.
• Use Check to validate all placed numbers.
• Use Hint to reveal one correct number.

scoring

Solve faster with fewer moves and hints for a better score. Each hint used reduces your final rating. The timer tracks your solve speed. Try to complete puzzles without using Check or Hint for the best experience.

tips

• Start with clues that have only one adjacent fog cell — the answer is immediate.
• Look for clue cells surrounded by mostly solved fog cells to narrow possibilities.
• Use elimination: if a clue's remaining sum can only be filled one way, that's your answer.
• Corner and edge cells have fewer neighbors, making them easier starting points.

faq