IOS is a first and third person online multiplayer soccer game that aims to be the online equivalent of great console soccer games but with a true multiplayer teamplay experience.

IOS requires Half-Life.
You can join a public game of IOS at any time during a match or you can create your own.
When you join the server you will be asked to select a team then you can select the position that you wish to play. This determines where you start on the pitch.
If that position is already taken the menu screen will not disappear, you must choose again.

SHOOT: Primary Attack (Left Mouse Button)

Shooting aims the way you are looking, it also uses the vertical aim to affect the power in the shot.
Aiming too high and the shot will go high very quickly.
Aim low and the show will have no power. However, this can be very useful for dribbling.
Strafing at the same time you kick will bend the shot.

PASS: Secondary Attack (Right Mouse Button)

Passing will find the nearest player on your team in your current view and adjust the strength of kick automatically.
If the target player is moving the pass aims ahead of them.
Aim low when passing to keep the pass low.
Aim high when passing to pass in the air.


Hold the sprint button down when moving to move faster.
The sprint gauge on the bottom right of the screen shows how much sprint you have left.
When the gauge is empty you cannot sprint and you will move at normal speed.
Sprint energy is restored automatically after a set time.


Press slide tackle to tackle opponents.
You will slide and get up again automatically after a short time.
If the tackle is bad the opposition will be awarded a foul.
You may receive nothing, a yellow card or a red card.


You can switch between firstperson and thirdperson at anytime.



The game decides which player should take these.
The nominated player is placed in position.
All other players are forced back.
If the ball is not played within a time limit, the whistle blows and play can continue.


If you receive a RED CARD you will be SENT OFF into SPECTATOR mode for an amount of time.
Press ENTER to rejoin the game after being SENT OFF.
If you receive two YELLOW CARDS you will get a RED CARD.
Each time you are SENT OFF the time you have to wait to get back into the game doubles.


mp_teamlist: Sets the team names. Normally the server will pick from teams that IOS supports but it is possible to override using this command. If the team name is recognised by IOS it will use player models of the same name.

mp_keepers <0-1>: This determines whether Bot Goal Keepers should be used. The default is 1, Bot Goal Keepers On.
mp_keeperskill <0-100> : This determines how good the goal keepers are. 100=best. 0=worst. The default is 75.
mp_redcard <0-999>: This is how many seconds players should be sent off for. It doubles for every red card they receive since it is possible to receive more than one in IOS. The default is 10 seconds.
mp_timelimit (default is 30 mins) determines the real match length. In the game display the time will be scaled to 90mins. Once the match has ended the server will load the next stadium map and the players can choose new teams.
mp_roundlimit : This ends the match when this number of goals has been scored by one team. The default is 10 goals.
mp_autobalance 1 : autobalance teams on or off. This will force a player to switch sides after a goal is scored if the teams are unbalanced in number of players.
mp_offside <0-1> : disable/enable the offside rule. Default is 1 (offsides on).

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RSS Articles

IOS is five!


Some screenshots from the first release of IOS for Half-Life five years ago! More pics on my dev blog at

IOS Beta 4.0a Server Patch released!


We are pleased to announce the release of IOS Beta 4.0a. This is a server only patch. You only need to install this if you run a server or host lan games...

IOS Beta 4.0 for Half-Life has been released!

News 1 comment

IOS Beta 4.0 for Half-Life has been released! Windows Full (102M) (UK) (USA) Linux Full (103M) Change Log: Added mp_clubteams 0=international only, 1=both...

IOS Tribute Video


Rebrov has created a cool new video celebrating IOS, it's community, teams and winning the ModDb "Sports Mod of the Year 2004".You can...

IOS Beta 4.0 Video! (Half-Life 1)

News 3 comments

I've created a video for Beta 4.0. It shows a few of the new features like improved animation, improved corners, improved free kicks and improved...

RSS Files
IOS Beta 4.0 Full Windows

IOS Beta 4.0 Full Windows

Full Version 14 comments

Beta v4.0 March 2005 by Mark Gornall and Phil McClenaghan Added mp_clubteams 0=international only, 1=both, 2=clubs only. Added mp_pickupeasy 0/1 off/on...

Comments  (0 - 10 of 79)
dany777106 - - 20 comments

Is there a way to fix the Half-Life icon?
Installing this mod caused the icon to change when i start Half-Life without the mod and uninstalling the game will make the icon don't display.

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fonxmaz - - 2 comments

How do you play the game?

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PsyWarVeteran - - 1,985 comments

Extremely unique but forgotten, reminds me of HL Rally.

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RecycledDoom - - 58 comments

I've gotten tired of not being able to reliably find games for old Gold Source (GoldSrc, HL1, Half Life 1) mods or Source (Half Life 2, HL2) mods, so I made a discord about just that. I am also trying to make this place an informational hub. I'm trying to centralize and unite the multiplayer mod communities for all of the various multiplayer mods out there. We play a mod of the week every Friday/Saturday.

Check us out.

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kim_sama - - 13 comments

What's the game start up song called?

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Guest - - 699,326 comments

This comment is currently awaiting admin approval, join now to view.

wawa26 - - 137 comments

Very unique and epic mod! Must try this asap

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HazarD. - - 59 comments

Dang dang..the progress was good..

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Counter_The_HL_Guy - - 714 comments

Ahi faltaría Tano Pasman como hinchada xD.

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SpeedyClaude - - 1,506 comments

IOS, hmmm........

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