Roughly about 10 years ago a collector commissioned a programmer to make a port of this game for the virtual boy. Originally meant to be a one-off production soon for whatever reason a small production run was made. Over the years there have been several production runs but much has been kept under wraps and only talked about in closed circles. Over the years this game has developed a substantial following and has gone up on eBay for astronomical prices. No I am not the individual who has manufactured this version of the game I am helping them to sell off a couple copies. These cartridges does have saving capabilities along with a full manual box newly manufactured PCB and it comes complete inbox.
Keep in mind this is only a recent production which has been ongoing for the past 10 plus years and this will be limited only a few at the time of this listing.