From Just Solve the File Format Problem
Puzzles encompasses electronic formats for all sorts of puzzles and brain-teasers, from crosswords to jigsaws. See also Game data files, Saved Games, and Interactive Fiction for other electronic recreation.
General puzzle formats
- IPUZ (open puzzle format; used for many puzzle types including crosswords)
- Softdisk Publishing UDF files were used for a number of things in Softdisk publications, including puzzle-type games.