Phantom Fighter is a single-player mini-game that was first introduced sometime during 2010. It can be played through the Games menu, through its icon in the Sol Arcade and Club Geoz, or by using the den version of the game.
The player must use the arrow keys to move back and forth and use the space bar to shoot at Phantoms. There are three levels: Easy, Medium, and Hard. The player can collect power-ups along the way. The regular Phantoms (that have blue electricity surging around them) are instantly destroyed by any projectiles, but some Phantoms have a temporary red electricity shield that protects them from the first standard projectile that hits them. Sometimes, phantoms will fire a small lightning bolt or fly down below the edge of the screen. If the player is hit by either of these, they will lose a life (they have four total). The terrain changes by the levels: lava fields, waterfalls, or town. Each level consists of multiple waves with different Phantom formations, and higher levels have more waves than the lower levels.
There are seven achievements to earn while playing Phantom Fighter:
- The red Phantoms shoot red lightning bolts, but they behave exactly the same as the blue lightning bolts.
- Phantom Fighter's outside look in Club Geoz matches that of Spider Zapper.
- Similar to the Summer Carnival games and Hedge Hog, Phantom Fighter is one of the few mini-games that allows the player to actually attack Phantoms.
- Phantom Fighter is very similar to the classic arcade games Galaxian and Galaga.
- Each power-up changes the appearance of the player's ship when it is equipped.
- The lightning-bolt and explosive power-ups are actually wider than they seem and can hit the sides of Phantoms when they pass nearby them.
- When not using the triple-shot power-up, the player must cross in front of the Phantoms to hit them. To avoid getting hit while using these, the player must frequently change position while firing.
- When using the lightning-bolt power-up, the player can cause the most destruction by aiming for an entire column of Phantoms.
- When using the explosive power-up, the player can cause the most damage by aiming for a large grouping of Phantoms.
- When using the triple-shot power-up, the player can often stay where the Phantoms can't shoot (such as at the corners of the screen) and fire continuously, relying only on the diagonal projectiles.
- If the player clears a portion of the phantoms from one side of the screen, they can wait there indefinitely without any risk of getting hit. During this time, they can collect the random power-ups that float by them.