Logic Masters Deutschland e.V.

This was set as Niverio's Secret Satan Gift 2025, part 1. Be sure to check out part 2 of the gift. Thanks to everyone who helped make this event happen, particularly to Andrewsarchus, ThePedallingPianist, and OopyLoopy for testing/puzzle help! What I sent to Niv this year was the message below and two pdf files, one for each part. The images below are the pcitures from the first pdf.

Well hello Niv, long time no agony!

I have attached your yearly abuses, I hope you hate them!

Worst Regards,
Satan

Credit to Azgaar's Fantasy Map Generator as the tool that allowed me to create the island in the image below.

Rules:

• Normal sudoku rules apply

• Nurikabe:
  • Shade some cells so that all shaded cells form one orthogonally connected area of water and no 2x2 region is entirely shaded.
  • Orthogonally connected unshaded areas form an island.
  • No two islands touch, even diagonally.
  • Each island contains a port cell whose digit is the size of the island.
  • Port cells must not be landlocked, i.e. they must be orthogonally adjacent to at least one water cell.
  • Each row, column, and box must have exactly one port cell and digits within port cells must not repeat.
  • Digits on an island must not repeat and sum to a multiple of its port cell.
  • A beach 🏝 separates a water and an island cell which are a pair of consecutive digits. Not all beaches are necessarily given.
  • The digit in a lighthouse counts the number of island cells in its row and column combined, counting itself. Lighthouses can be on either water or island cells and can also double as port cells.
  • Clues outside the grid are Aquarium clues, i.e. they count the number of water cells in the indicated row or column.