Survivor Tips
1: (Survivor Tip) If you have lower hp than everyone else, you should know that the zombies see that and preferably go for you.
2: (Survivor Tip) Don't go backwards [S] in an attempt to escape a zombie. They will catch up and you will pay for the bullets you gave him. Instead shift between going forward and turning around to shoot.
3: (Survivor Tip) If more survivors have a medkit, do not heal yourself unless you are really close to death. Instead heal others and get points. Other medics will heal you, don't worry.
4: (Survivor Tip) Always observe how the game flows. You should only buy from the arsenal things that will increase people's survival chances (example: Barricade Kit, Medkit, Better weapon, Ressuply crate etc.).
5: (Survivor Tip) When your team engages zombies in the open, make sure you are not a sitting duck. Instead, parkour around while damaging zombies.
6: (Survivor Tip) Watch out for loose small props. You can get prop killed by a zombie before you even know it.
7: (Survivor Tip) If you have an arsenal/ressuply, make sure you look after them. If zombies reach them be sure they will be destroyed.
8: (Survivor Tip) Headcrabs are easier to kill with a fast melee weapon instead of trying to shoot at it and probably wasting a lot of ammo.
9: (Survivor Tip) Always watch out what zombie boss has awaken. You should know if you are a target for him.
10: (Survivor Tip) Never lose sight of your fellow teammates. Zombies will easily take you if you are not close to your friends to protect each other.
11: (Survivor Tip) If you don't want to volunteer for the zombie team before the round starts, make sure you are as far away from their spawn as possible.
12: (Survivor Tip) Want to get in or out of a cade? Press and hold Z while walking through.

Zombie Tips
1: (Zombie Tip) Press F3 to change zombie class when your current one is inefective.
2: (Zombie Tip) Fast zombies are usefull for killing survivors that are out in the open. Do not go charging the cade as a fast zombie. It's useless.
3: (Zombie Tip) Poison headcrabs are very usefull when attacking cades. If you hit a survivor with poison you incapacitate him for a few seconds, which will aid your team.
4: (Zombie Tip) Always go for the easy targets. Each kill you make, adds another zombie player to your team.
5: (Zombie Tip) You should always go for the most wounded survivors if they are in your range.
6: (Zombie Tip) If you are a zombie boss, choose it wisely. If you don't know which one to pick, ask your team for help or pass the boss status to someone else. (F1-options)
7: (Zombie Tip) If your team needs a nest, do not make it wide in the open. Find a hidden spot.
8: (Zombie Tip) Headcrabs are small. They can also fit through small holes.
9: (Zombie Tip) When attacking a cade, you should always pick bloated zombie. They are the best at that job.
10: (Zombie Tip) When all humans are in a cade and the wave is close to ending, stop. Stay away from their bullets and protect the nest and/or kill any that try to come out.
11: (Zombie Tip) Talk to your teammates and decide which prop from the cade should you focus on attacking for faster breaching.
12: (Zombie Tip) If survivors have more cades, make sure that if one is breached it cannot be repaired between the waves.