Hitbox.io

Hitbox.io is a multiplayer arena battle game in which you control a small square that can jump, send projectiles, catch your opponent or use a bat to return these same projectiles. The arenas are different and varied and include numerous platforms, traps to avoid and voids into which you must not fall. The duels with other players will be technical and tactical, you will have to be precise but also vigilant when you are attacked. The "quickplay" mode will allow you to play instantly on a random map but you can also create your own customized games and invite other players. There is also a training hall to learn how to handle your avatar and use different skills.
Hitbox.io is a game developed by Chaz, the creator of the famous game Bonk.io.

Note: If you cannot find an opponent in quickplay mode, try the "custom game" mode where many games are created there.