Portal

Overview
Portals are on Object only found in the mobile version of Awesome Tanks. They appear as coloured circles on the stages, and when entered will teleport the player (and anything else which goes into them, including enemies) to the corresponding portal; this is indicated by their colour; a blue portal will be linked to another blue portal, but not to a red portal.

When to use them
Portals are useful if you wish to get to another area of the level quickly; however since enemies can also go through them, being near one poses a risk as an enemy may come through it at any given moment. Also note that there could and often is enemies present around the other portal; going through will often result in several enemies seeing you, and firing at you; this makes using them extremely risky even if you're well upgraded.