Sneaking route is up to you
-Open doors locked with a lock-pick.
-Find windows unlocked.
-Use the ladder to climb various places.
-Keep yourself low, quiet.

Stretched out traps
-Dark rooms are risky. Visualize traps by lighting up. You need Thermal Goggles to detect some traps.

To select presents
-To select best present, observe rooms carefully which change every time you play.

The other things to remind
-Find hidden items and focus on them with First Person View.
-Contains 3 stages(Ver1.0)