Most io games don't require you to make an account to play, but some do. You just enter your username and go. They are usually played in a web window and don't require any downloads other than the plug-in that makes the game work. This makes it even easier and faster to join. Many also have mobile apps that let you play them anywhere.
Simple rules
Most of the time, just looking at the game screen is enough to figure out how to play. Some games have a quick introduction to explain a few more details, but it shouldn't take more than a minute to understand how to play the game.
Player vs. Player
In io games, you compete against other people, either on your own or as a team.
Power growth
As a player plays, they get stronger. A player's amount of power is often shown by how big his character gets. But if you get kicked out, you often lose most or all of that power.
Gameplay
It is more important than the story, and most of these games have no story at all. Only a few games hint at a background, like Surviv.io, which has change log notes and short, well-hidden audio recordings. and BattleRoyale.io, which has Flavor Text in its Monster Compendium.
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