This happened yesterday I think, although my Japanese isn't so hot. Anyhow, the files are available to download from this link:
https://jppuzzles.com/jpcjnpc/wscwpc-se ... /download/
Note that this is the same link as for the sudoku round. Only the first three links are relevant to the puzzle competition. The last 3 links are the ones already posted from the sudoku competition.
As before, the first link are the solutions, the next one is the competition file, and the last one is the instructions.
The password for the competition file is:
jNVgVaTsbeJfCp