.io games explained: territory games like Paper.io, free to play

What “.io” means

It is simply a web domain: after Agar.io’s huge success in 2015, many similar browser games chose the .io domain and the name became a genre. Today a “.io game” usually means the following.

It opens right in the browser with no sign-up or download.
Many people on one field in real time.
The rules are very simple, but mastery takes time.
Losing costs little: you are back in a second.

The territory capture genre

There is one rule: you draw a line around an area and are defenceless until it closes. So every player weighs risk and reward every second. In Agar.io the small flee from the big; here even the smallest player can topple the largest with one well-placed line. That is the feeling people are after when they search for “play Paper.io”.

How Hudud differs within the genre

Feature	Hudud
Opponents	real people; bots are always tagged BOT and leave as people arrive
Payments	no power-ups, coins or payments in the game; everyone is equal
Walls	does not kill, your head slides along it
Ping	the head is predicted: turns are instant even at 200 ms
Language	Uzbek, Russian, English
Look	a bright round arena, smooth raised territories, no cartoon faces

Hudud is not affiliated with Paper.io: it is an independent game in this genre, made by the GameUZB team.

What makes a good .io game

Fairness. The server decides, and neither screen size nor money gives an edge.
Speed. One second from the button to the map, one tap from knock-out to the next run.
Smoothness. It does not stutter even on a modest phone or a slow connection.
Depth. The rules are simple, yet on your hundredth run you still find new tricks.

More multiplayer games.

Also searched as

People look for this genre in many ways: play Paper.io, territory io, land capture game, draw lines to claim land, захват территории. However you phrase it, playing is one click away.