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Symbiosis

Perform a 4x Combo in CO-OP.

Symbiosis0
2 guidesOffline Game ModeSingle PlayerCooperativeExternal Content
Canadien BakinCanadien Bakin525,343
07 Dec 2012
1 1 0
This does not require 2 people. When you start up Campaign, choose co-op. Play the first mission and do a triple combo with one character and quickly switch characters with your left hand and do one more super attack.

Once you hit a 4x Combo this will automatically unlock.

Apparently you can do this in Co-op Arcade Mode as well with two characters you feel comfortable with using/switching between to combo their Super Attacks.

Thx to Munoz2024 and bozack for the helpful tips.