Matclub is a map with 4 teams. The fourth team is the team with the secret (1337 dancer). The secret is behind the door where a picture is.

Go up to the picture and press use (e by default) a few times and then you will come to a room that looks like this:

his room is a maze. Me and Illusion have done this maze and I made the video of us doing it (video). Here are 2 pictures of the way:

Overview of the start of the maze:

Overview of the left hand side of the maze:

Once you have found your way through the maze you will have to do a series of moves with the corners, watch this video to see me do it: Video.

The moves are as follows:

Looking at the machine (bomb machine) go to the right hand side of it to the corner, jump and press use, then turn 180 degrees and run to the opposite corner jump there, then turn left about 110 degrees and run past (NOT INTO) the exit sign and jump in that corner, then do another 180 spin and go once again to the opposite corner.

You now have control over the maze :D.