The basic premise of Killing Floor is to survive all of the waves, whilst welding doors to trap your team mates. There's many problems that can prevent survival of the waves, such as the Zeds and doors being welded, however the main cause of failure is ignorance. This guide is for new players who want to dive straight into normal or hard, because beginner is for noobs, and will offer in depth advice of how to survive the waves and reach the final wave - where the Patriarch guns down the team.