N64 had to be gotten at through the official dev tools and libraries, they never told the games studios how it all worked internally. Just like Xbox. and that's why both are crippled compared to PS2 which came with full documentation for the hardware and a dev kit that was more like a bare compiler.PS2 devs started from scratch making their own engines, N64 and Xbox devs didn't. It's why PS2 has so many wildly different feeling and looking and sounding games, while Xbox and N64 all kinda feel likey they were made with the same games maker software. Because they were.