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
In Witcher 3 you could craft crossbow bolts and sell them to buy more ingredients to craft crossbow bolts and make unlimited money. They patched this out to where you could no longer sell crossbow bolts.