Below Arc

Overview
Below Arc is the first map of the Arc Islands. It's like a thinner and longer version of Construction Site, but the air enemies approarch from the north.

General Strategies
Due to the limited width, there is no much variety in placing the tower bases. Enemies from two sides should be tracked to the opposite direction to the core, and eventually gather into a middle tunnel toward the core. Since the tunnel is always two-grid wide, players should add left-and-right twists to significantly slow enemies like Rhinos.

Besides Snorkers and Jumpers, all ground enemies in this map are slow, which is an useful advantage to utilize.

Spore Keepers frequently appear and are not easy to be defeated in a short time, which makes enough amount of them being able to get to the core unavoidably. But it should be noticed that they're actually the least threat to the core, since they can attack only by launching homing spores at a really low rate. You can keep them from damaging the core at all via using rapid firing weapons to deflect their projectiles, in doing so you have however many time to kill them, yet of course, you need to ensure that they are the only remaining threat on the field before all.

Towers
 * 1) Anti-Air: For air enemies.
 * 2) ACP: If upgraded enough, it delivers excellent crowd control against Snorkers, Rhinos and Heavy Pups.
 * 3) Slow Field Dispenser: A really effective method to enhance your killbox, since there is limited space for it.
 * 4) Focus / Lightning: Against heavier enemies. However, consider the thin and long tunnels instead of U-shape corners, Focus can't track a single enemy for really long without a method to slow them, so Lightning can be a good replacement here.
 * 5) Orbital Strike Relay: If you're on a multiple players run, it's even more recommended to have one brought this, it's extremely effective against Heavy Pups, Spore Keepers, and Infected Explorers. It's best to have its range covers the core as well.

Weapons

You basically need one weapon for crowds and one weapon for singles. The long tunnels make it easier to hunt weakspots for snipers.


 * 1) Gatling Laser / Plasma Rifle: They fit both purposes above, so why not?
 * 2) Sniper Rifle: If you decide to stay beside the core instead, this is also a good choice for its long range accuarcy.
 * 3) Drone Launcher: Good against Spore Keepers and makes Wave 9 super easy.

Perks
 * 1) Core Guardian/Long Range Superiority/Steady Aim: For snipers or if you use Drone Launcher.
 * 2) Reinforcements: Since most enemies are aggressive, this effectively makes them pause frequently and suffer much more from crowd damage.
 * 3) Tactical Juxtaposition: Only for Drone Launcher.

Wave 1
Enemies

Strategy
 * Combat: Kill Bobble Heads first, it should be easy as they walk straightly for the most time.

Wave 2
Enemies

Strategy
 * Build: Spore Pods approarch but not in big amount, so Anti-Air isn't a must in this wave. Besides that, you only need some Focuses or Lightnings.

Wave 3
Enemies

Strategy
 * Build: One lvl 3 Anti-Air should be enough.
 * Combat: Priorize Hoverers first. Since they traverse the opposite direction to the core, it's really easy to hunt all of them down with weapons alone.

Wave 4
Enemies

Strategy
 * Combat: Kill as much Mutators as possible before they meet with Walker Warriors in the middle tunnel. Before that, they're always alone, so you won't be distracted in dealing with them for a good amount of time.

Wave 5
Enemies

Strategy
 * Combat: It's inevitable that Jumpers will get to the core immediately. You can, however, minimize their damage to the core. You should expect yourself sticked at the core to deal with them. Gatling Laser's secondary attack will bring them down rapidly without the need to aim.

Wave 6
Enemies

Strategy
 * Build: Use resources you preserved in the previous waves to build up a high rank ACP. You can start placing some slow fields around it as well.

Wave 7
Enemies

Strategy
 * Build: A high rank Orbital Strike Relay can be considered to be deployed at this wave, or you can upgrade your Focuses or Lightnings instead. Also, you may need another Anti-Air for the increasing number of Spore Pods unless you can handle the excessive part of them alone.

Wave 8
Enemies

Strategy
 * Build: Enhance your current towers is enough, so do the later waves.
 * Combat: Again, focus on the Mutators before they make Infected Explorers super annoying.

Wave 9
Enemies

Strategy
 * Combat: With Drone Launcher, this wave can be finished super easily. An it's not much harder if you use other weapons, still.

Wave 10
Enemies

Strategy
 * Combat: Don't be shocked by how many types of enemy there suddenly are. Kill the Jumpers first like how you did in Wave 5, and the rest of the threat is usually no more than the Spore Keepers.