Riot Games did this one year for April Fools in League of Legends. Normally you can play a 5v5 match against other players, beginner bots, or intermediate bots.

Riot Games did this one year for April Fools in League of Legends. Normally you can play a 5v5 match against other players, beginner bots, or intermediate bots. For April Fools, they rolled out "Advanced Bots", which were actually another group of 5 humans, but with their username replaced with "<Character> Bot". Word got out pretty fast, but it was super funny queuing up for a game you'd normally win easily and being surprised at how smart those bots have gotten...