Examples Within Games- Thief
Thief Mechanics-
There are many different objects within the real world for Garret to interact with, such as cabinets to peep around, cupboards to hide in, and locks to pick to gain access to certain areas. This gives me ideas on how to gain collectibles and ways to continue the story line.
Thief Hazards-
Hazards are to be avoided as they usually hurt, but more than often within Thief, hazards are primarily things that alert guards than things that hurt you. This means that it can be anything obvious from shattered glass on the floor that makes noise when you walk through it. There are also things later on in the game such as hidden traps that can hurt/alert the guards to Garrets whereabouts.
Thief Props-
Many levels in Thief are scattered with intractable and optional objects that you can either steal or use as a distraction to the guards. Many of these optional props have a worth, but are not paramount to the story to steal them. There are also things such as candles within Thief that Garret can snuff out, despite them not being obligatory to extinguish them.
Thief Puzzles-
Within the game, a puzzle is needed to exit or enter a new area. They come in many different forms, but physical sliding puzzles are most common, such as matching a sliding tower to a real one outside the window, or matching symbols to those found around a room. Many are obvious, but some are very difficult as they are timed.