Play Friend Play Friend

Hello Slitherio crazy players! Welcome web site. I present to you, my self-made play with friends userscript for

The installation is quite simple, although it has one caveat. Here we go:


  • Step 1: Install my userscript

    for Greasemonkey and Tampermonkey (depending on your browser).

  • Step 2: Block the original javascript, to prevent having the game run twice, one instance of the original Slither, and one instance of my modified one. You can do this using AdBlock plus. See “Blocking the JS” for help.


That is it! Enjoy playing with your friends! You must play one time and die, so you get to the replay screen and you will see your IP address

Then, a friend can copy this IP address into. Wait 1 or 2 seconds, and he will automatically join that room.

You can also see your coordinates, so you and your friend can find eachother. Your coordinates are shown in the Check the leaderboard to confirm you are in the same room.

Blocking the JS

This is an easy process if you use AdBlock Plus. Click the AdBlock Plus icon in your bar, and click

Then, right click on the js script. This looks like, where xx is the current version.

Anyway, right click on that script, and click Block this item. Then, make sure it’s a blocking filter, select “custom”, and enter*.js So you have to replace the version number by an asterisk (*).

That is it! Go play with your friends! Feel free to ask any questions. Check the leaderboard to confirm you are in the same room.

Alternative download link

Note for Turkish visitor: Türkiye’den girenler, telekom tarafından kapalı. DNS adresinizi değiştirin veya ZenMate kullanın.

If you visiting from Turkey please change your DNS or use ZenMate. is blocked on your country.


  1. Asking questions are really good thing if you are not understanding anything fully, however this article offers fastidious understanding yet.

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