On top of all the other examples, Hayazashi Nidan Morita Shogi 2 was a cancelled SNES games from 1995 that was going to us a 21MHz ARMv3 processor for AI. I just like the idea that they would throw in a processor that was probably about 5-10 times the power of the main system CPU.

That a very similar spec ARM processor would become the brain of the Gameboy advance many years later.