You will be dealing with two different groups of objects. Let's start with the GRENADES, because they are far more important during the game. Furthermore, you will be using them very often. FLASHBANG GRENADES are used to blind enemy soldiers. Thanks to that, you are able to kill them without having to use cover or moving a lot. Bear in mind that the enemies are stunned only for 2-3 seconds. After that, they will start shooting at your team. You have to be quick about it, especially while trying to blind a whole team of enemy soldiers. Alternatively you could use this time to find a better cover or let the squad take new positions. FRAG GRENADES are very common. I guess I don't have to explain how they work. The most important thing in this case is to throw them precisely at the enemy team. Otherwise you would have sacrificed this object for nothing. Thankfully, grenade throwing is a very simple task, especially since a path will be shown on your screen. Frag grenades are also very useful to kill enemies standing by ladders. These situations have been mentioned in the walkthrough section of the guide. SMOKE GRENADES are commonly being used in order to organize a surprise attack against enemy soldiers. Bear in mind that these objects won't blind terrorists completely. They will still be shooting at your teammates. The only difference is that they will have a hard time spotting your colleagues. Smoke grenades can also be used to help you move to a more suitable cover. PHOSPHORUS GRENADES for the most of the time are pretty useless. I would recommend that you pick something else instead. Frag grenades seem like a good idea. You can also combine different types of grenades (frag & flashbang, frag & smoke...). The second group consists of the ADDITIONAL EQUIPMENT. I wouldn't recommend using any of these objects. It's just a waste of time, at least in my personal opinion. You will be able to choose between a HAMMER and some BREACH CHARGES. Both of these objects are being used while opening doors, however I'd recommend more traditional methods. Remember that you can order your teammates to storm the nearest room with or without using flashbang grenades.