Contrary to popular belief, it was not Nintendo's first arcade game. Prior Nintendo games include Computer Othello (released only in Japan), Sheriff (released in the U.S. by Exidy as Bandido), Space Fever (released only in Japan), and Space Firebird (released by Nintendo and Gremlin Industries in the U.S.).
Radar Scope was the first game that Shigeru Miyamoto helped develop. Although the game was only a modest success, Miyamoto's subsequent Donkey Kong - which was based on Radar Scope's hardware, and used surplus Radar Scope cabinets - was extremely popular. It introduced the character of Jumpman (now known as Mario), and helped cement Nintendo's major status in the video games industry.
As captain of the Sonic Spaceport, players must defend their station against enemy spaceships called Gamma Raiders, which attack with vengeance and swiftly retreat to formation. The object of the game is to destroy 48 enemy Gamma Raiders before there is total disintegration of all the Spaceports on the player's side.
Players can counterattack with the Rapid-Fire Laser Blaster which zooms the lasers over the three-dimensional-esque field of curving vectors, while it intercepts enemies. The lower on the radar screen that you destroy a Gamma Raider, the more points will be earned. If exploding decoys damage the Sonic Spaceport, the Laser Blaster's firing speed will reduce. The Laser Blaster's "Damage Meter" will light up as damage is incurred and when fully illuminated, will weaken the Laser Blaster's offensive powers. To reverse this, the players must attack and destroy all remaining Gamma Raiders.
Players are given a wide range of flexibility in controlling the difficulty levels of the game. Extra Spaceports are awarded at 7,000, 10,000, 15,000 and 20,000 points, as determined by the players. The initial number of Spaceports may also be pre-programmed at 3, 4, 5 or 6. When the required number of spaceships is destroyed, players receive an extra point bonus.
Yamauchi assigned the game's designer, Shigeru Miyamoto, the task of "fixing" the game so it would appeal to gamers. Rather than tweak a poor game, Miyamoto designed an entirely new game, Donkey Kong, using the Radar Scope hardware. Out of the 3000 arcade units originally manufactured, around 2000 were converted to Donkey Kong. The converted units can be spotted by their red cabinets. Conversion kits for the new game were then shipped to North America, where Donkey Kong went on to become a huge success. As a result, Nintendo established itself as a powerhouse in the North American video game market.