Of course there will be a save feature! I've read on herointeractive's Bubble Tanks 3 blog, you will be able to make your own tanks, so of course there will be a save feature! I've also read that you can get allies and a lot of new guns! Also, tanks that other people have created (and you created) will keep downloading new tanks from the server! Check out the herointeractive Bubble Tanks 3 blog for more details.
Pykrete has a point there, on armor games I had a ship named "The Leaf" and it was a class 1 tank! I beat all of the original arenas with that tank. The advantage of having a lower class tank is you are really fast, get machine guns, super machine guns, etc. The disadvantage of a lower class tank is that you get less life, you don't get the strongest weapons, and you can't get the super weapon. For beginners, I'd have to say go with higher class tanks, as they have more life. For pros, I'd say go with lower class tanks. Or just go with what you like! By the way in bubble tanks 3, there will be a tank editor too! Also if anyone is confused, Bubble tanks Arenas is NOT Bubble tanks 3! To find out more, go to Hero interactive.com for more on bubble tanks 3.