Each mission takes place on an island with the two armies facing off against each other. The player's role in the game is to lend support to your army, by taking out threats, punching holes in the enemy defence and completing specific mission objectives. The Battle Engine has two modes of operation: "Jet mode" allows the Battle Engine to fly for a limited time, "Walker mode" transforms the Battle Engine into a mech-like walking tank. When the Battle Engine is in Walker Mode, its weapons are considerably stronger than when it is in Jet Mode and it has energy shielding (making it harder to be destroyed) but is MUCH slower than jet mode. There are, by the end, 4 different types of Battle Engine that one may choose to pilot: Pulsar, Blazer, Lancer and Sniper. In earlier levels only the Prototype Battle Engine is available, which is essentially the same as the Pulsar ship but lacking the Grenade weapon that is utilised when the Battle Engine is not airborne. The Sniper Battle Engine only has 1 airborne weapon (the others have two each), the Vulcan Cannon, but it is the only ship that can engage a stealth mode, rendering it invisible. This capability drains the energy of the Battle Engine, as if it were flying.
There are multiple weapons that are available for the Battle Engines that can be used:
- Walker Mode Weapons: (Depends upon which mode you use; Pulsar/Blazer/Lancer/Sniper)
- Pulse Cannon (Pulsar/Blazer)
- Beam Laser (Lancer)
- Rail Gun (Sniper)
- Vulcan Cannon (Pulsar/Sniper)
- Blaster (Blazer/Lancer)
- Grenade (Pulsar/Blazer)
- Flux Missile (Lancer/Sniper)
- Jet Mode Weapons:
- Micro Missiles (Pulsar)
- Vulcan Cannon (Pulsar/Blazer/Lancer/Sniper)
- Spread Bomb (Blazer)
- Torpedo (Lancer)
There is a way to utilise Walker Mode Weapons while the Battle Engine is airborne. It is possible for the Battle Engine to be in Walker Mode momentarily as it falls from the sky after changing from Jet Mode while it is flying. However, this technique can be difficult to perform because as the Battle Engine falls, it can be particularly difficult to aim the weapons, and landing without using retro thrusters from a great height will probably result in the Battle Engine exploding and therefore Game Over for the player. It is also useful when needing to bring powerful weapons to bear against large enemy numbers without needing to dodge.