One day I saw my friend playing survivor.io. I first thought that this game is just easy boring game. but, as more as I see this game, it got harder. You can go to chapter 12 with no money use. but if you go to chapter 13 it is almost impossible to clear with out using money. This game is a very fun game to do. But it has a crazy difficulty and it has a hard balance. I think this game is good for playing for a short time when you have no game to play. Then have a nice Chuseok. Bye!