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There are several viruses that can be found at the end and inbetween points in sector stages, known as Boss Viruses, or simply bosses, while some are even considered "mini-bosses". They are obviously much stronger than other viruses in the sector, and deal bigger damage to the player. When the boss virus of a sector stage is defeated, the current game will be completed and the player(s) in the current game will then be sent back to the game room to continue another match, or to partake in some other activity. There is also the possibility that when a boss is defeated (only certain bosses however), it may drop boxes and other items. The boxes may contain useful items that can be used by players. These items are known for having a (+1), (+2), or (+3) extension, adding more bonus statistics for higher value extensions.
Known Boss Viruses
NOTE: Click the name of the boss virus to view its main article.
Bosses are listed in order of appearance.
Main boss of Training-Camp, also appears in other stages. It has low hp and is easy to beat, so it is made a miniboss in other levels that it shows up in.
A removed enemy from the game. It is quite similar to Bubbleboy, and it was found in the Training-Camp's hidden area. When attacked, it would play sounds resembling a Korean's voice. When defeated, Boot-Killer would appear. This enemy does not drop items. It didn't attack anyone, but just stood there.
A removed enemy from the game. It was found in the Training-Camp's hidden area. After defeating Hong it appeared. It had a large amount of hitpoints and was rumored to drop "black boxes", though proven untrue. Nothing happens if it is defeated. It's hitpoints and damage from each attack were high.
Main boss of Training-Ring.
Main boss of Mine-Entrance.
Main boss of Data-Mine.
Main boss of X-Entrance.
According to /monsterinfo, it was actually named a jumble of characters, but is still a removed enemy today, not to be confused with I-worms in Main-Core and similar stages. It appeared in X-Escape, and was an indestructible enemy. One touch from this enemy would defeat a player in one hit, or at least do a extreme amount of damage.
Main boss of Micro.
Main boss of Macro-Dock. (Note: This enemy used to appear in other areas as a mini-boss, but was removed from them in earlier game patches).
Main boss of Macro-Passage. Has a drill for attacking, but also uses a wide-range fire attack.
One of the two bosses in Main-Core. This virus is required to be destroyed to finish the stage.
Similar in appearance to the more powerful T-2000-Illuminator, it is a continually respawning enemy in the Main-Core-Escape stage. It will not stop reappearing until the stage is completed upon destroying the Door. This enemy does not drop item containers.
Not actually an enemy, but is required to be destroyed in order to finish Main-Core-Escape. This enemy does not drop item containers.
Similar to the Brain and other relatives for having the trait of not being able to move or attack. It is required to be destroyed in Escape-the-Deck and Sink-the-Ghost-Ship to finish the stage. This does not drop item containers.
This boss is the leader of Hacken-Core, and is known among players to be quite more challenging than any other enemy in the game. No other enemy is similar to this virus in terms of body composition, and is one of the strongest of all viruses.
This enemy, although no longer available until the next winter holiday event, can be found on any stage and is part of the winter holiday events. This enemy wll appear randomly on the stage and attack players. It is said when defeated, it has a 3 to 4 times more chance of dropping item containers. This enemy does not take the place of non-mobile enemies.
There is an approximately 15% chance the Snowman will appear on regular stages and 5% chances on elite stages, where drop rates are multiplied by 4 to 5 times.