Addicting Online Games

Does anyone find Agar.io addicting? I personally have spent many hours on this little game and can't control myself.

If not, what other online games do you find addicting?

Ah, yes.
This game had me addicted for a long, long time. I even had installed the app on my phone, so I could play it during a boring class. But after some time, it seemed not so interesting to me, so I switched to playing Cards Against Humanity online. This game, I swear, is the first game ever to make me laugh so much. I almost got out of breath from laughing, really! I love picking cards that have absolutely nothing to do with the black card, which most of the time turns into a hilarious sentance.

Man, if you do that, better use an authority site *mod edit*

I'm not addicted but I can spend some free time there