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Not to be confused with the Twin Flank, which grammatically fits the description of the Quad Tank or the Octo Tank, one of the upgrades that branch off of the Quad Tank.
The Quad Tank is an upgrade from the Twin or Flank Guard at Level 30 and previously the Triple Shot at level 45. It can be upgraded further to the Octo Tank or Auto 5.
Since it has two pairs of opposite Barrels, the Quad Tank does not have any recoil. Individual Bullets fired from this tank deal three fourths of a Bullet used by a Basic Tank, but the Quad Tank shoots in four directions.
- Strong Against: Multiple Low-Level enemies, low health tanks.
- Weak Against: Focused bullet spammers such as; Twin, rammers, Snipers, Overseers/Overlords
As the Quad Tank
Quad Tanks are decent at dealing with crowds of Polygons and great at dealing with many lower-Leveled tanks. As a result, farming and multi-kills have never been simpler. As you have four Barrels, you can get two or more into range of your Barrels and spam Bullets.
Beware of fast rammers, as they can bump into your weak points and quickly kill you. To counter, it is best to have high Reload, Bullet Speed, Penetration, and Damage and block your weak spots.
This tank is weak against most tanks with focused fire, such as the Twin and Triple Shot, not to mention the Sniper. It has many weak points compared with other classes of its tier, so do your best to protect yourself, as you have four weak points where players can damage you from.
You can easily defend yourself in games by clicking "c" and "e" keys to simultaneously auto-fire and auto-spin. This will make the most of your tank, people have a hard time shooting in the gaps.
Beware of drone users as well, as the speed and damage of their drones can mean that the drones easily find and pierce the gaps between your bullets.
This tank is best used with a teammate; and though it has a good crowd-control ability, it is generally weak against focused fire tanks when left alone, so staying with your teammates is recommended.
Against the Quad Tank
The Sniper tree (excluding the Trapper branch) are hard counters to the Quad Tank. They can easily pick it off due to the slow speed the Quad Tank has and its four gaps between its Barrels. This allows for an easy kill in all diagonal directions.
Body Damage builds can also take advantage of the large gaps by ramming into them. Try to leave your movement unpredictable by moving left and right to try and take minimal damage.
- C+E — Upgrade to Quad Tank
- It is used to be a Level 45 tank when there was a Tier 5 in the game.
- It is one of the first tanks to be added in Diep.io.
- Contrary to popular belief, the Quad Tank’s bullets are slightly stronger than the Twin’s.