Logic Masters Deutschland e.V.

Rules:

Place the digits 1-9 once each into every row, column, and box.

A digit N on a circle counts how many digits in the (up to 8) surrounding cells have a digit greater than or equal to N.

A digit N on a square counts how many digits in the (up to 8) surrounding cells have a digit less than or equal to N.

A grey line can be split into one or more non-overlapping segments, each summing to 10.

Play on SudokuPad

Have fun solving!