Logic Masters Deutschland e.V.

Place all of the digits 1-9 in each row, column & 3x3 box.

Non-consecutive: No two orthogonally connected cells may contain consecutive digits.

Yin-yang: Shade some cells such that all shaded cells form a single orthogonally connected group and all unshaded cells form a single orthogonally connected group. No 2x2 region may be fully shaded nor fully unshaded.

Palindrome: The sequence of values along a grey line reads the same when starting at either end.

Doublers: The value of any unshaded cell is the digit in that cell. The value of a shaded cell is double the digit in that cell.