the sixth soul is thunderman soul.It takes awhile to get.and by that point beating Duo id almost impossible on Super Hard mode.It took me more than 100 tries,like 40 folder revisions,and cruising through the undernet picking up the powerups,and other stuff throughout the three modes to finally beat the wacked out dude.
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[color=darkred]drop me a line on my Gaia account: X x XCaracarnX x X