For Nintendo, up until 1991, they had been passive towards Sega's approach in North America, but as the SNES launch approach, the company recognized that they were losing ground. The company shifted their advertising in North America to focus on more of the advanced features of the SNES that were not present in the Genesis, such as its Mode 7 to create simulated 3D perspective effects.[26] The initial shipment of one million SNES units sold out quickly and a total of 3.4 million SNES were sold by the end of 1991, a record for a new console launch, but the Genesis maintained strong sales against the SNES.[2] The Genesis's resilience against the SNES led several of Nintendo's third-party developers to break their exclusive development agreements with Nintendo and seek out licenses to also develop for Genesis, including Acclaim, Konami, Tecmo, and Taito. Of Nintendo's other third-party developers, Square Soft remain committed to the Nintendo platform, while Capcom arranged to have a special licensing mechanism for select games to Sega for them to publisher rather than publish themselves.[27]