Enemies are invisible unless there in you're line of sight, this means you need to be looking roughly in the direction of the enemy Adrenaline - If you play the game you might notice that as time goes on you will graduelly get faster, adrenaline applies every 15 seconds for until it doubles you're base speed Ranked is in the game if you enjoy it enough to see how far your gun skills can get you, my best rank was Master with 1453 Elo, if you can make it to the top rank somehow i will actually be amazed