Level select -
Press ~ to display the console, then type "map [level code]" using the 
following information to skip to the corresponding level:

Level - Level code 
1 - jug1 
2 - jug11 
3 - jug9 
4 - jug16 
5 - jug18 
6 - jug8 
7 - jug3 
8 - jug17 
9 - jug10 
10 - jug19 
11 - jug13 
Deathmatch 1 - jdm1 
Deathmatch 2 - jdm2