'Tersa' is a very typical beginner level. Level uses texture number 0 which is probably the worst thing you can do with your level. There are no details (take a look at the screenshot), just rooms connected to hallways. There are no teleports and connectivity is poor. Weapon placement is also poor - you hardly see any other weapons than pistol which is annoying and quite much against the rules of deathmatch. There are no shadows. Bathroom is the only decent looking sector in this level.