Io games have been popular for a long time, and they're a great way to kill time whether you're alone or looking for something to do with a friend or two. It is browser-based. We've selected some of the best.io games to play with your friends right now.
Slither.io

In this https://iogames.games game, slither around a large map as a cute little snake and collect power-ups to grow longer and larger. You are not alone, however, as there are other players in the area. Make sure you don't run into them or you'll lose the game! If you're feeling particularly devilish, you could try tricking others into colliding with you instead.
Agar.io
Begin as a small petri dish and move around the field, absorbing any small agars you see floating around. Your petri dish grows in size as you absorb more. You can even eat other players if you see them floating around! Become the game's largest petri dish and swallow everything that floats in your path.