The HT-130 and Object 156 O were two tanks added to the game for testing purposes, designed with level II and VIII respectively. With their flamethrower firing mechanisms, these tanks can hit targets that are hidden behind small obstacles or at close distances without relying on armor penetration rate - instead, the damage done is determined by the thickness of the target's armor. This makes such tanks very effective against lightly armored vehicles but not so much against heavily protected ones.
The main weapon used is an automatic powder flamethrower. What's more, thanks to its strong frontal armor, it can act as a break force in group assaults and provides tactical advantages for players - they can choose to either follow heavy tanks with fire support or lead actions of medium tanks in storming weak defenses. Its high speed qualities can also be a great advantage for such tasks.