Marble

The Marble is the tier 5 tank that can turn invisible.

Design
Marbles have a circular base with a thick octagonal border just like Jump Smasher has, but there are cracks in the circle, resembling a broken marble.

Technical
The Marble is the same as a Jump Smasher except it can turn invisible.

Upgrades
The Marble can upgrade from at level.45. The Marble doesn't upgrades any further.

As the Marble
You can use your ability to become invisible to suddenly kill people without them even seeing you. Head to the Pentagon Nest, then wait to turn invisible ignoring all the crashers. Make sure you have a high body damage and max health so you do not accidentally get killed by other tanks. Then, wait for a tank to move near you, then suddenly jump towads and killing that tank.

Against the Marble
While moving around, check if any invisible tanks are still visible. If you see a Marble, then turn your bullet speed and damage to a considerable amount. Then, you can snipe the Marble with tanks like Sniper Rifle, which should kill it.