Hi there! Here are some .io games that you can play directly on your (computer) browser. I'm listing them as a personal top 10 from worst to epic.

Coming up in number 10 is
Agar.io
Its old, & mainly kinda unfair.

#9
Snowfight.io (I think.)
A great kid fiendly shooting style game with a creative design- snowballs! Though it lacks exitement most time.

#8
Slither.io
Its a game where you guide a snake, makin your enemies crash into you, like Tron but you cant run into yourself. Its a fun game, exiting too but sometimes too much. Some gigantic guys can just trap you.

At number 7 is
Space1.io (I think. Just search it up)
Its a space game where you guide your fleet of triangles, shooing in 1 click. It lacks background though; too plain.

#6
Diep.io
I understand that its a gr8 game but in ffa you get spawnkill'd after sk'd after sk'd. Even after you level up a couple times then you get killed. I know its how the game works but it just makes you rage.

#5
Tanx.io
its a semi fast action game where you control tanks. Gr8 game. Try it out! Not the best tho, I admit.

#4
Blockergame.com
Gr8 massive realtime multiplayer game. But your character choises limited and not much coins to bypass.

You should just search this up:
Tiny Planes
Its an attackplane game with multiple game styles. Not much players at most times though.

#2
Suadd.io
A fast action shooter but very LAGGYY and others seem to kill you so fast! Thats gonna take off a lot of points.

At number 1 we have... *DRUMROLL*
Slay.One
Another great semi fast action game I like how you dont have to buy your weapons but really dislike having to pay to start a game and having to level up to unlock gamemodes.

Well... thats all. Thx 4 your time! Have a Gr8 day!