WTF Is...? (more recently has the question mark been omitted) is one of TotalBiscuit's most defining series. In this series, TotalBiscuit gives first impressions on a wide variety of video games across multiple platforms, especially PC games. The first game ever covered on the channel was R.U.S.E., while the first to use the iconic thumbnail was a video for the game Anomaly: Warzone Earth. The series as a whole has well over 250 episodes.