I can't even remember of vanilla map better than this one. Grim Outpost by Andrew Smith is the only real competitor I can imagine. This map is intricate. But also extrememly engaging. Because it challenges you nearly constantly. You're always near dead. Ammo is always near out. But not in hardcore manner, nope. It's not hordish or something. It's just challenging and hard for real, but fairly and very friendly to any quaker - even completely new (as I was when played 1st time). It's hard in a way that it feels like real castle, filled with enemies, who want to stop your progress thru interiors. Just that. Real life infiltration of not real life dark fantasy fort (or castle as u wish). That's very cool feeling. Experience! This map is quite an experience. I wish everyone to experience it once in life at least