A Keeper's Training does everything right as both a teacher of the game mechanics and as an introduction to the Thief universe.

The basics of sticking to shadows and keeping off loud surfaces are presented simply. They're easy enough to solve without being condescending, and likewise the combat and object-handling areas are more than fit for purpose.

Where this mission really shines is in its atmosphere. More than just being an obstacle course, it evokes a real sense of mystery and wonder in the Keeper compound. Clever use of light and texture, and the use of architecture to hint at real areas out of our reach, make the area look bigger and deeper than it really is.