Some tips:

1) The game uses a microphone. You can turn off the microphone or change its sensitivity: Menu-> Audio (that's why the match goes out)
2) The "F" key disable / activate the flashlight
3) Press on the keyboard 1 to use the phone, 2 to use a cloth etc. (like in FPP games)
4) Codes and riddles are generated randomly
5) The location of items in the game is always random
6) Characters have random dialogs (they say differently every time)
7) You can take notes on your phone and save codes
8) Are 5 type of light: match, flashlight (need battery), candles, ultraviolet (worst), lighter (need a gas)
9) Using a mouse wheel to zoom (Magnifying glass, papers etc.), middle mouse button = extra action (sometimes)
10) Brazier can remove frozen, from second room (hover your mouse over brazier or fire...)
11) Easy mode contains all hints (this mode is recommended to everyone)
12) You can see your progress in game: NEW GAME -> EXTRAS -> STATS