Logic Masters Deutschland e.V.

The sequel to Rika's Endless Summer. (Mark's CTC solve of Rika's Endless Summer)

After nearly 7 years as a member of the J-pop group BEYOOOOONDS, it is time for Rika Shimakura to leave Japan and head overseas to Treasury Island (loose translation of Shimakura) for an endless Summer. Nobody but Rika knows where Treasury Island is, but it is somewhere in this grid...

Can you find Treasury Island?

Normal Sudoku rules apply.

Nurikabe Killer:

All cells are either island or water.

Each lavender cell is an island cell.

Each island must contain exactly one lavender cell.

Different islands may not touch orthogonally.

The water cells are orthogonally connected and may not contain any 2×2 areas of water.

Normal Island rules: Each island also contains a set of non-repeating digits that sums to the lavender cell total if given. If no total is given, the sum is 6, 9 or 25. The number in the lavender cell is the number of cells in the island. Killer totals are not necessarily in the top left most cell of an island.

Treasury Island rules: All islands are normal except one - Treasury Island, which has no given total. On this island, X's mark the spot - i.e. Treasury Island can be evenly divided into non-overlapping dominoes that each sum to 10. The lavender cell's digit is inconsequential and digits may repeat.

F-puzzles

Sudokupad