There should be new terrains... Water terrain: Powers up water shots and is immune to fire. (Tanks are able to go inside) Ice terrains: Simple, fire is just a little flammable and tanks slip a bit further. Just a idea.
A terrain were you in a waste land with radition and you take damage every second from radation poising, But nukes do double damage; but they are twice as rare on that terrain.
moon terrain: a place where every shot is like the last shot on a gravits (the one that isnt very affected by gravity) and all damage is doubled
Night Terrain - You can't see where your tanks and weapons are, but when you shoot (like when you actually shoot something, that moment), the map will be illuminated for 5 seconds (the illumination will start to fade when there's two seconds left), where you can see them. 1.5x Xp multiplier is added to the game bonus.
Space: every 5 turns instead of their being an EQ there is a random asteroid that comes down making a crater in the ground (size of a massive shot). if that asteroid hits a player it does 30 damage. 1.2 multiplyer
Futuristic terrain: Teleports all players to a random spot each turn. And every 3 turns there is a laser storm.
Random terrain You need to buy this one... cost 50 coinz. Every 10 turns 15 xp is given to a random player; and there are 5 boxes dropped down randomly
Death Terrain Causes 10 points of damage per turn in deathmatch mode. 1.5X damage in points mode. Rubber Terrain Causes shots to bounce 3 times, or until they hit an enemy. Would basically turn 5-bounce into 8-bounce.