World of Warcraft - Copper Farming
Now back when I was playing World of Warcraft, the most effective way to make Gold was farming copper, for me, this is my brag because it's the longest I have ever played a game without stopping.
I was short on Gold and was getting very frustrated with not having enough gold to buy potions and boosts for raids, this was back in WOTLK. So I decided right, enough, I booked two days off work and arranged with my wife that I needed time to farm gold, she was playing at the time so she understood.
I literally spent nearly 48 hours straight, farming Copper and selling it on the Auction House, Silvermoon Alliance being a VERY busy server, it sold stupid fast to the point I was one of the few putting it on, so I was able to up the price slightly.
I literally made around 8k Gold from that farming exercise. So I'd say that is my biggest brag on gaming, making that much gold in that short amount of time on WoW. I literally just went round the Barrens in a circle, around the edges, over and over again, ofc I found time and Mithril up near Ashenvale as well, so that helped.