Shin Nihon Pro Wrestling Toukon Retsuden is a professional wrestling video game released for the WonderSwan handheld system. While specific details on development history are scarce, it's likely a product of the popular pro wrestling genre prevalent in Japanese gaming at the time. Gameplay likely involves standard wrestling moves, grappling, and pinning opponents.  The game's focus is on the simulation of professional wrestling matches, providing players with the experience of controlling their favorite wrestlers.  The 'J' likely denotes a Japanese language release, and the '[M]' might indicate a mature rating, though precise rating systems varied across regions and platforms at the time. The developer and publisher information for this title isn't readily available through common sources. 

Shin Nihon Pro Wrestling Toukon Retsuden (J) [M]

Sennou Millenium (J) [M][!]