HAVE YOU BEATEN COOKIE CLICKER YET DOE?
There's no real definitive end to the game, but since the cost to buy a building increases the more of that building you own there's a certain point where the cost gets so high the game can't process it and registers the cost as infinity cookies. If you consider that on all buildings + getting all upgrades and achievements to be the end of the game, then I am nowhere near close.
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