The gamemode is fundamentaly what you expect it to be, one team pushes the Nuke Titan and the other needs to stop it from reach the checkpoints for 5 minutes.

Just like in Team Fortress 2 or Overwatch, the pushing team needs players nearby the Nuke Titan to make it move, it goes faster the more around it, up to 4 only, no more than that needed for it to go full speed.

One major change from the other games though is that the Titan can be halted on place but never moved back to the previous points in the path.