(View image directly for larger form.)
or solve online (using our beta test of Penpa-Edit tools; use Tab to alternate between number entry and shading)
Theme: String Lengths
Place the 12 number strings into the grid, reading from left to right or from top to bottom, so they are all connected criss-cross style and also form a valid Nurikabe ocean. No unlisted string can appear anywhere, not even two-character ones, and the strings do not occupy any 2×2 area. The remaining white cells are part of islands as in a Nurikabe puzzle. Each island is represented by one number in the grid which equals its size in cells.
Or see this example from the 22nd WPC instruction booklet.
Answer String: For each column from left to right, enter the total count of zeroes from the entered strings. Enter the result as a single string (eg “401120…”)
Time Standards (highlight to view): Grandmaster = 7:00, Master = 15:00, Expert = 30:00