Over the years I've played battles on every single one of Tanki's maps. I would like to describe some of the rarest maps and give players an insight on the variety of gameplay tactics they can discover when playing on something other than Sandbox, Polygon, Serpuhov or Silence.
Berlin
The second biggest map in the game after Dusseldorf. Unlike Dusseldorf, this one isn't a flat, boring arena with a bunch of identical buildings arranged in rows. There asymmetrical bases make gameplay different for each side, so you have to use different tactics depending on which team you are on. The map suits all kinds of equipment and play styles. You can camp with Shaft or Rail and shoot enemies across the whole map, you can attack right down the middle in a medium tank or sneak into the enemy territory via the outskirts.
Camp
A very unique map with reverse flag placement. For many years this map was solely meant for TDM matches, where player bases were on the two different islands and no bridge connecting them. The only thing in the centre was a flat platform, where one could jump down and the only way off was death. Now, the extra bridge connecting the two islands has created a map with rather unique attack strategies. You really have to think hard about when you attack, where you attack, who goes first and when to return your own flag to capture the enemy's. Great for practice with friends if you have voice communication.
Chernobyl
A great map, where you have to carefully think about your surroundings and be aware of the enemies' positions. The whole map is divided into three main sections - the top floor of the reactor for long range guns to rain fire on the enemy base; the elevated bases with flags, where defenders often hide behind the nearest building; the bottom area, where attackers carry flags. The large structure in the centre (the nuclear reactor) provides great cover for attackers, especially with short range guns. You can grab the flag, run into the tunnels, hide behind the corner and ambush any enemies when they follow you inside. Players with Shaft often prefer to stay on their side of the map, opposite the flag, to shoot attackers as they come up onto the platform to grab the flag.
Deathtrack
One of the biggest maps with an interesting layout. Great for players with light hulls, who just like to do blitz attacks on the enemy base and run away on high speeds. The multiple ways of approach allow you to easily navigate between obstacles to choose the best way of attack in order to remain unseen and to take the least damage.
Esplanade
One of the highest maps in the game. Has three main ways of attack, each one unique in tactics required for approach. The special abilities of different guns can really come in useful here when used by skilled players. A carefully positioned Freeze will be great for defense, but any good Thunder or Rico can easily take out the defense on the flag from a safe distance, using walls to their advantage. Firebird can be used to burn a whole bunch of enemy players at the flag, when they all pile up together. Shaft or Railgun can be used for sniping on the outside fields or from the top. And last but not least - this map is great for effective maneuvers when you grab the flag, escape through the top and jump down while doing barrel rolls at the same time.
Factory
One of the newer maps, which was quickly forgotten after it was added. The map has three ways to attack - directly through the centre for the tough ones, from the top for the strategic ones and around the edges behind buildings for the sneaky ones. Play on it yourself and choose your own strategy.
Future
This map was added at the same time as Factory. Very interesting layout with many levels of action - on the rooftops, on the bridge and on the ground. The map is relatively open, so you can freely choose which way you want to attack from to get the most out of it. Good map for all types of guns and light-medium hulls.
Gravity
A very unique map that looks like a mix between Madness and Noise. Gives players an opportunity to do some crazy platform jumps and amazing ninja attacks on the enemy base. Great practice for those, who want to learn how to shoot accurately when you and your opponent are on different levels and at an angle to each other.
Gubakha
Very confusing but interesting map, where the respawn areas are all limited to a small boxed in area on the side of the map - one for each team. The map is square and the respawn zones are located so that once you spawn on the red team, the blue flag will be on the opposite side of the map, the red flag will be on your left, while the blue team spawns will be on your right. On the blue team this is reversed - the red flag is still on the opposite side of the map, but red respawn is on the left and the blue flag is on the right. Enter the map and see for yourself :)
The design of this map also allows for different tactics. You can occupy one of the two camping zones in the corners of the map and snipe people from there, you can hide in the trenches and ambush unsuspecting enemies, you can try and go after the flag over and over, you can sit in the centre of the map and control all movement around you, or you can sit near the flag and strategically place mines. The choice is yours.
Industrial Zone
One of my favourite maps. Lots of different pathways through holes in walls of buildings or through tunnels and off jumps. If you know this map well, then you will easily be able to confuse your disoriented enemy as you jump in and out of various gaps and hop through passageways all over the place. A new player won't even be able to find the flags when they enter that map for the first time, so do take the time to learn the map before you try and play a battle there.
Other interesting rare maps:
What we really need is a club where we create battles on rare maps every day and play on them together. Anyone remember this beauty?