Logic Masters Deutschland e.V.

Puzzle link: Play on SudokuPad.

Rules: Normal Sudoku rules apply. The grid contains three separate gravity wells: one in row 2 or 3, and two more somewhere in the grid. All cells that are orthogonally or diagonally adjacent to a gravity well belong to its “inner ring”; all cells orthogonally or diagonally adjacent to the inner ring (except the gravity well itself) belong to the “outer ring”. Each number on the inner ring must be smaller than the number in the well. Each number on the outer ring must be smaller than all orthogonally or diagonally adjacent numbers on the inner ring. If a cell belongs to rings of several different gravity wells, it must fulfill the stated conditions for all of them. Along a thermometer, numbers strictly increase from the bulb end.

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6x6 Example: Solve it yourself on SudokuPad if you like. Normal 6x6 Sudoku rules apply. The grid has to contain two separate gravity wells (instead of three as for the full version). All other rules are the same. In the shown solution, the resulting gravity wells are marked in red, the inner rings in orange, and the outer rings in yellow.