(adsbygoogle = window.adsbygoogle || []).push({}); This has been out for a while but you can now play source games in splitscreen by deleting some mutants using process explorer, here is a video not made by me,
[ame=https://www.youtube.com/watch?v=ecnZa9RoVtM]YouTube - Split-Screen Team Fortress 2 (Two Player Mod!!!) Tutorial! *MUST SEE*[/ame]

Also here are threads that can help you.

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If you need anyhelp just ask I use it sometimes