Escape From Mystwood Mansion

This was just the right amount of clever for me. You enter a mansion and work through a series of rooms (all independent). There are codes all over the place, padlocks, cryptic patterns etc. Slowly you work out what goes where, and solve each puzzle, unlocking a piece of something you need for another puzzle. The contained space of each room means you know that the answer is within reach, which makes it very digestible. There's also a good amount of physics freedom, like you can put the objects you need for clues next to the puzzle.