[2] This was hardly convenient for Konami, which had begun releasing more than ten games a year for both the Famicom and its Disk System add-on in Japan.

The IBM PC and Commodore 64 conversions of Teenage Mutant Ninja Turtles and Metal Gear were also published under the Ultra branding.

After the North American launch of the Super NES in 1991, Nintendo started relaxing the restriction on the number of games third parties could publish each year.

[4][5] Its library was relatively similar to Ultra's but the company also published games that were not released in North America, notably Road Fighter, Parodius and Crackout.

In contrast, some games that were released under the Ultra name in North America, such as Metal Gear and Snake's Revenge, were published under the regular Konami brand in Europe.