10
10 Levels: 10 Monsters
10 Minute Massacre
10Minutes
10 Sectors
10S Forever
10x1024
10 Years After
10 Years of Doom
1187
1187: Episode One
11th Dream
1213: Episode 1
1213: Episode 2
1213: Episode 3
128 Linedefs, 64 Things
12 pm Break
12 Vengeful Ghosts
1337D00m
1337 Ship Deathmatch
1378km
14
1492: Anno Domini
150 Line Massacre: The Golden Skulls
1.