Aye, that was times back then!
Originally Posted by SOBgaming
Can you explain the rules?
Freezetag is quite much like Teem Deathmatch, with the following addition:
Whenever people die, they are frozen. Kinda like "sm_freeze", with some markers around them.
It is then quite similar to hostages from hostage rescue maps with a tiny difference.
You will use your USE key (typically E), for like 5-10'ish seconds or so, and when you have done that, the dead player will resurrect.
In 2009, [CSS] Team Freeze Tag
was crated, which sounds quite similar.
In 2012, there was a similar request for CS:S: css freeze tag like mohaa???
Later in 2012, a similar TF2 specific plugin were released: [TF2] Freeze Tag
The fact they mention CS:S or TF2 doesn't always mean that they won't work in e.g. CS:GO or other games, so to begin with, I would personally suggest trying them out.