CirKill

CirKill is a virus in the Mega Man Battle Network series that only appears in Mega Man Battle Network 4.

CirKills move around the enemy's side in a circle, firing at MegaMan whenever he steps onto their row. The best way to deal with these is to use the ElemIce chip on an Ice Tile, and doing this usually gives a Counterattack when done correctly.

CirKill
CirKill is an orange variant.

CirKillEX
CirKillEX is a blue variant.

CirCrus
CirCrus is a red variant.

CirCrusEX
CirCrusEX is a light green variant.

CirSmsh
CirSmsh is a purple variant.

CirSmshEX
CirSmshEX is a gray variant.

Battle Chips
Deleted CirKills yield the Circle Gun series of Battle Chips. When used, a target reticule circles the perimeter of the enemy's side. Press the A button to stop the reticule, attacking the targeted panel and the next three panels in sequence. This chip also appears in Mega Man Battle Network 5 and 6, even though the CirKill virus does not. These chips are cursor-type. As the CircGun is of a higher class, the faster target reticule will be.

CircGun1
Inflicts 80 damage. Letter Codes are H, T, and Z. Dropped by CirKill.

CircGun2
Inflicts 100 damage. Letter Codes are D, G, and T. Dropped by CirCrus.

CircGun3
Inflicts 120 damage. Letter Codes are J, M, and R. Dropped by CirSmsh.

Battle Network 5 and 6
A 'black' version of the Circle Gun appears in these games. In Battle Network 5, it inflicts 100 damage and has the Letter Codes A, C, and F. In Battle Network 6, it inflicts 150 damage and has the Letter Codes P, T, and V.

Dark Circle
Dark Circle is a Dark Chip only found in Battle Network 5. It works the same as the other variants, except this one targets seven panels rather than four and inflicts 300 damage; stricken enemies also take 50 damage when the Custom Screen opens. However when used, MegaMan permanently loses 1HP and a bug occurs that causes him to lose 100 HP when the Custom Screen opens.