The Saturn hardware is extremely difficult to emulate. Sega responded to complaints about the difficulty of programming for the Saturn by writing new graphics libraries which were claimed to make development easier. Sega of America also purchased a United Kingdom-based development firm, Cross Products, to produce the Saturn's development system. Despite these challenges, Treasure CEO Masato Maegawa stated that the Nintendo 64 was more difficult to develop for than the Saturn. Traveller's Tales founder Jon Burton felt that while the PlayStation was easier "to get started on ... you quickly reach limits", whereas the Saturn's "complicated" hardware had the ability to "improve the speed and look of a game when all used together correctly". A major criticism was the Saturn's use of 2D sprites to generate polygons and simulate 3D space. The PlayStation used a different design, based entirely on 3D triangle-based polygonal rendering, with no direct 2D support. As a result, several analysts described the Saturn as an "essentially" 2D system. For example, Steven L. Kent stated: "Although Nintendo and Sony had true 3D game machines, Sega had a 2D console that did a good job with 3D objects but wasn't optimized for 3D environments."