For example, the Prune Juice upgrade for Grandmas requires that players own 50 Grandmas. The upgrading system present in the game is based on the number of a certain cookie generator that the player owns. RELATED: Destroy All Humans: Best Weapon Upgrades, Ranked It's a lot more than watching numbers go up – and the new version of the game on Steam adds even more. On the surface, it's nothing but a mindless idle game, but it's actually much more complex thanks to new mechanics added over the years and a near-endless progression system that continues to feel rewarding. Cookie Clicker is a deceptively simple game.
