File Extension SPZ File Format SudoKoach puzzle file SPZ stands for SudoKoach puzzle file. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question When trying to access encrypted files, access is denied? who deleted the spool file Best puzzle-type games for PS4?