Logic Masters Deutschland e.V.

The following quote may serve you well in solving this puzzle:

Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.

Arthur Conan Doyle

Rules

Fill the grid with the digits 1 to 7 such that:

• Digits do not repeat in rows or columns.
• Digits on the three circles are odd.
• Orthogonally adjacent cells do not sum to 5, 8, 10, or 12.

Then divide all of the unshaded cells in the grid into 24 regions each of which consists of 1 or more orthogonally connected cells that sum to 7. All 2 cell regions in the grid must have a horizontal orientation.

Please leave a comment if you complete this puzzle.