CTF stands for Capture the Flag. This game mode is supported in Diabotical . There are different variants of this type of PVP in video games. In most instances, player will attempt to capture an enemy flag and bring it back to their own base without losing their own flag in the process. In other games, it could refer to a flagged position that players must overtake and defend for a specific amount of time. There has not yet been a lot of detail presented to players regarding how this will work in this FPS arena, but hopefully we have more information soon.