Logic Masters Deutschland e.V.

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Place the digits 0-8 once each in every row, column and 3x3 box.

There are a number of snakes hiding in the grid. Each snake forms a one-cell wide orthogonally connected region which does not branch. Each snake contains the digits 0-8 once each. Snakes do not touch each other, nor themselves, not even diagonally.

Each circle is on a snake and the digit in the circle is equal to the number of prime number digits in the immediately surrounding cells (including itself). Note that neither 0 nor 1 are prime numbers. Each circle contains a different digit.

Each square gives the number of snake cells in the immediately surrounding cells (including itself) and each square contains a different digit.

The grid is partially covered in fog. When certain cells are filled, some fog may clear, possibly revealing more clues.