Very well made and designed. I did encounter a glitch in one level where if you take a wrong turn, the level repeats itself complete with all the reanimated monsters you previous killed - a very odd glitch (Delta Lab 1). However, game play is done well, weapons are awesome, the rooms, hallways are incredibly detailed. I read where some people felt game play was predictable, but if the monsters are hidden, waiting for you, they have to hide somewhere. I did not find it overly predictable. Throwing genades in places where I thought monsters would be hiding yielded little results - its not that predictable. Scary in places, where things jump out at you in places where you figured you were safe. Simply a great game.