From Lazarus wiki

This program is only available in the Files section of CCR (the zip contains the source).
The code itself is not in CCR.
The code and .lfm needs modification (4 lines) to compile in current Lazarus/fpc.
It needs further modification to properly be able to read the cells (input and output).
Should it (the source) go in /applications/sudoku?
If so, I can put it there and modify it so it actually works. --Bart (talk) 19:39, 2 January 2020 (CET)

Sources are in lazarus-ccr now and are updated to make it work as expected. --Bart (talk) 17:11, 4 January 2020 (CET)