Author/Opus: This is the 1st puzzle from guest contributor Dan Adams.
Rules: Place digits into some cells and shade all remaining cells so that: each dodecagon contains the digits 1-9 exactly once; digits in cells sharing a vertex with a black triangle add up to the indicated clue number without repeats; and shaded cells cannot share an edge with another shaded cell.
Answer String: Enter the digits in the marked central rows (triangle, hexagon, triangle, …). Use a capital X for shaded cells. Separate each row with a comma. The example has the key “8178XX,243”.
Time Standards (highlight to view): Grandmaster = 16:00, Master = 32:00, Expert = 1:04:00
Note: Follow this link for other less common Number Placement puzzles.