It's a rough time for fans of several live service games, which are titles designed to be constantly updated for a long time. A bunch are shutting down in the near future, and CrossfireX and Knockout City are among the latest to join the list.
CrossfireX is an Xbox console version of the massively popular tactical shooter Crossfire. After some delays, it arrived less than a year ago, but it wasn't a hit with critics or, more crucially, the public. Developer Smilegate has stopped selling the game (the multiplayer component is free-to-play, but the Remedy-developed single-player campaign is not) and is offering refunds for purchases made in the last two weeks. It will shut off the CrossfireX servers on May 18th.