Catack

Catack is a virus in the Mega Man Battle Network series that resemble a tank operated by a small shady figure. They appear in Battle Network 5 and 6.

Catacks slowly advance forwards one panel at a time. Each time they move forward, they will stop and fire their cannon. The blast will push the target back if it is hit, but if this goes uninterrupted, the blast will engulf the left-most column on the target's side. Once Catack reaches the target's side of the field, they will capture any panels they touch, but will stop advancing once they've reached the middle column. If two Catacks are present in battle, both will advance simultaneously, but only one will fire at a time.

Catack Family
EX Catacks are only encountered in Battle Network 5, while the rare variants only appear in Battle Network 6.

Catack
Catack is a green and pink variant.

CatackEX
CatackEX is a blue and yellow variant.

Cateen
Cateen is a red and blue variant.

CateenEX
CateenEX is a yellow and grey variant.

Catpult
Catpult is a purple and green variant.

CatpultEX/CatackSP
CatpultEX is a black and dark red variant.

Rare Catack
Rare Catack is a silver and yellow variant.

Rare Catack 2
Rare Catack 2 is a gold and brown variant.

Battle Chips
Deleted Catacks yield Tank Cannon Battle Chips (TankCan).