How to Slender Mode: Custom Classic
1 on T, 2 or more on CT
Turn knife to an instant kill, and turn up the knife range and speed. The Terrorist (or Slender) can only use the knife and must keep flashlight off.
The CT can only use Deagle and must keep on the flashlight.
Turn on Night mode and turn up the fog for some fun!
For the 2nd Wompoon level, unlock rocket and camp at the bottom where your team's flag is with the rocket. Use your map to see where enemies are and I guarantee that you'll get a lot of kills. I got 136.