Left 4 Dead 2.
The Sacrifice.
Expert difficulty. Realism mode.
Speedrun with bots.
There is no cheat. Just luck & skill.
I didn't use any shortcuts because I don't like it.
If you have X hp, first aid kit will heal 0.8*(100-X). I used first aid kit in safe room after first chapter . 67+0,8*(100-67)=93,4
Don't be surprise about full hp of bots after death. It's bug/feature of this campaign. You can check it yourself.
If you think it isn't expert look closely at health (my or bots). Infected damage on expert 20hp (10hp from back). Tank damage - 100hp.
The number of common infected (who can exist at the same time) is limited (thanks Valve). New zombies could be spawned by AI Director if you killed some of them before. If you don't kill them in the beginning you haven't problems with them in the end.
Thank you for watching & comments.
![](https://i.ytimg.com/vi/XUQbeLPR6vg/maxresdefault.jpg)