It can be any game, including ones that have already come out.
My choice would be COD 4. If that game didn't come out, COD wouldn't be all the rage and the console market would have way more creative games.
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Cod 1 so no cods would be made. That in effect might stop twelve year old screaming, cod wanna-bees (halo 4), copy&paste games hopefully, no perks, people would think games with skill might sell more, etc. I wonder what would happen without cod.