At levels 15 and 30, the above classes upgrade to even more powerful tanks. They are as follows:
Machine Gun– Cannon increases the angle and shoots projectiles faster
Twin– Adds a second gun shooting at the same frequency
Flank Guard– Fires in two different directions
Sniper– Increases the range of vision and the projectile damage. Class with slower shooting

4 DIEP IO
At levels 30 and 45, the above classes upgrade to even more powerful tanks. They are as follows:
Flankguard-> Twin Flank -> Octotank
Twin-> Triplet -> Pentashot
Machine Gun-> Destroyer -> Mega Destroyer
Sniper -> Overseer -> Overlord
Source: [diep io](http://diepiofree.com/)
Comments: ** Comment from web user: amirr **
Machine Gun– Cannon increases the angle and shoots projectiles faster
Twin– Adds a second gun shooting at the same frequency
Flank Guard– Fires in two different directions
Sniper– Increases the range of vision and the projectile damage. Class with slower shooting

4 DIEP IO
At levels 30 and 45, the above classes upgrade to even more powerful tanks. They are as follows:
Flankguard-> Twin Flank -> Octotank
Twin-> Triplet -> Pentashot
Machine Gun-> Destroyer -> Mega Destroyer
Sniper -> Overseer -> Overlord
Source: [diep io](http://diepiofree.com/)
Comments: ** Comment from web user: amirr **
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