Tomb of the Sands. A spacious map in an Egyptian setting.
It features many places where it's easy to die, and even leave your skeleton behind in a deep pit after death!
The map includes achievements, and upon completing them, you can choose a reward that lasts until the end of the game: a sniper rifle, Serious Damage, or +100 health.
There's also a unique chance to respawn as an invulnerable monster that you'd better avoid encountering for at least half a minute.
Music by Kadath