Rainbow Six Siege has been around for more than two years now, and in that time, it's gone from a competent shooter that had problems to one of the biggest multiplayer games around. Following the release of the most recent expansion, Operation Chimera, Siege hit its highest-ever concurrent player count on Steam, and Ubisoft now says it wants to continue supporting the game until it reaches 100 Operators, rather than make a sequel.

But how did we get to this stage? How did Ubisoft turn an innovative-but-flawed game into the behemoth it is today? Simply put, the company did so by persevering -- with free downloadable content, an appropriate microtransaction model, and continual improvements. Just recently, for example, all of Rainbow Six Siege's base Operators were made free, while a bunch of characters were buffed or nerfed. For more on the latest expansion, check out all the Rainbow Six Siege Outbreak pack weapon skins, uniforms, and cosmetics, or read how the newest Operators, Lion and Finka, affect Siege's metagame. For now though, let's look back at what Siege was, how it's evolved, and where it stands today.