Follow our crystal clear walkthrough and helpful tricks to get you through the rough spots!

* Place the WINCH in the mechanism; turn it (U).

* Use the NIPPERS on the wire and remove it; take the WEIGHT (V) and EMPTY OILCAN (W).

* Place the EMPTY OILCAN on the shelf and use the KETTLE WITH HOT WATER on the spigot (X).

* Turn the spigot; take the FULL OILCAN (Y).

* Back out; enter police station.

* Use the FULL OILCAN on the hinges; open the locker. Take the photos (Z), CONTROL STRING (A) and TIM'S TOOLBOX (B).

* Select the boxes (C).

* Back out twice.

* Select the lab door (D) and enter.

* Pour the beakers (E) into (F). Take the AMMONIA (F).

* Place the CONTROL STRING in the slot; pull it twice (G).

* Open the box; take the HEX KEY (H).

* Take the VACUUM PUMP (I).

* Use the HEX KEY on the bolts twice; take the GAS BURNER (J).

* Place TIM'S TOOLBOX, VACUUM PUMP, AMMONIA and GAS BURNER on the table to trigger a puzzle (K).