Call of Duty zombies and multiplayer. I peaked time wasted during COD BO3 because at that point I had gotten really good at both zombies and multiplayer after years of playing both.
My only regret is that the old games are all dead and hacked. I don't play video games anymore although I am playing Elden Ring right now for the first time. I'm near the end game and have paused on progressing the story so that I can be summoned to fight bosses in other worlds. I have played the shit out of Dark Souls and Bloodborne, but I don't have the patience and time to get good anymore, so I love the co-op. It is the coveted easy-mode that journalists have wanted. I always assume that those guys don't actually play video games and just create articles about social commentary.