Starting with the basics of stealthy moving and shooting, training exercises advance to tactical planning and challenging Kill House scenarios. There's really not too much tutoring going on, especially in the Rescue Hostage exercises. You are placed in the environment and expected to practice until you consistently achieve a positive outcome. When bursting into a room, depend upon about one half-second to get your gun on the target and squeeze the trigger, or you're dead. Opposite rooms in the office complex are a real bear because as you enter one room, your back is facing the other doorway.
Rookie level has a primary objective.
Veteran adds a secondary objective. Expert adds more terrorists and demands a high level of expertise and success. The Planning Phase is a jaw-dropper, but it's pretty easy to get a handle on. The first four missions have default mission plans for your convenience. It's very helpful to see a plan already laid out.