Logic Masters Deutschland e.V.

• Normal Sudoku rules apply
• Yin yang: shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.
• Round trip: a 'virtual loop' is formed by 12 pairs of cells. Each pair consists of two horizontally connected cells, whose digits are the row and column number (in that order) of the leftmost cell of the next pair on the virtual loop. Example: if the pair R1C3-R1C4 would be on the virtual loop and R1C3 = 8 and R1C4 = 1, then R8C1-R8C2 would be the next pair on the loop.
• In every pair on the virtual loop, the leftmost cell is shaded and the other cell is unshaded.
• Every row, column and 3x3 box contains at least 2 cells which are part of the virtual loop.
• Pink lines are renban lines, grey lines are palindrome lines and the blue line is both a region sum line and a ten line.
• Every line contains either only shaded cells or only unshaded cells.
• Cells on lines are not part of the virtual loop.
• Digits separated by X sum to 10. Digits separated by V sum to 5. Not all X's and V's are given.

Solve on SudokuPad

For definitions see below

• Renban line: contains a set of nonrepeating consecutive digits in any order
• Palindrome line: digits on a palindrome line must read the same in both directions
• Region sum line: box borders divide the line in segments. The sum of the digits in a segment is the same for all segments
• Ten line: line can be broken into one or more non-overlapping contiguous groups of digits that sum to ten