When I was playing dying light with friend we discovered that every timw you go to sleep and wake up air drop will appear, if you don’t know air drops are pretty rare and if you collext them and deliver to one guy you will recieve lots of xp, we used that multiple times to unlock grapling hook very early. Air drops also gave lots of medicine which was hard to get in early game and that very helped us
Similar when the Casion update dropped. You could spin the wheel, see it not stopping on the car, and then quit out of the game before it stopped. This way you could spin the wheel multiple times (and load the game for 30min every time, seriously what happened with that mod a guy made and got it to boot 70% quicker?) and once you got the price, you would claim it and park it in the garage. This way to get super cars for free. But not sell them.