Level Codes:
First type in ~ to bring up the console then typ map <level code> as described below.

For this Level Type map + this code 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