The box is the standard international version with additional stickers in Japanese covering the English game title.
Earlier copies of the game have one sticker at the box front and black/white manual. Later copies have one additional sticker at the box top, left or both spines and colour manual.
Each game released by Cheryco also includes a free promo flyer, that is also available in PDF format on this website at this page.
Apparently, the cartridge contains the early game ROM program featuring the "fat and brown" version of Dangerous Dan. This is yet to be confirmed, though. Any information on this would be greatly appreciated.
VTech
Cheryco
VTech
Telefunken MicroTEK
Sanyo Video
Zanussi Elettronica
Elof Hansson
Dick Smith Electronics
Salora