Space Mountain
Platform: Sega SG-1000
Region: Japan
Media: Cartridge
Controller: SG-1000 Joystick
Genre: Shooter 
Gametype: Licensed
Release Year: 1984
Developer: Tsukuda Original
Publisher: Tsukuda Original
Players: 1 or 2 Alternating
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Space Mountain is a Shoot-'Em-Up game, published by Tsukuda Original, which was released in Japan in 1983.

http://www.gamefaqs.com/console/sg1000/home/916342.html