First of all I want to say that these maps aren't full-sized single player maps or multiplayer maps. They are very small, low detailed maps made only for practice. Also, if someone takes these maps and tells people that he made it, I will sue their ass!
Kill The Shambler This map tests how good you are at getting out of sticky situations with low ammo and no guns. It's a bridge in the middle of nowhere with no ammo, weapons, or armor. Just you and a shambler. And trust me, it is possible.
Shooting Gallery This map is for beginners only. It teaches marksmanship. I have to say that this map is the easiest to master.