Multiplayer is one of the hardest parts of a game to develop. It’s a coding nightmare combined with game design paralysis. For this reason, a lot of indies don’t make a multiplayer mode for their game, and rightfully so — if it isn’t feasible to develop for your game, you shouldn’t force it in just because you think it will add longevity or versatility to the game. But what if your game is multiplayer-only? There’s a select few indies that have taken on this daunting challenge, and only a few that have come out successful. Thanks to a Steam sale, Indie Game Insider picked up one that changed IGI's perspective on indie multiplayer: Guns of Icarus Online.