Original sentence: Alternating play replaced the arcade's co-op play in the NES version (although Double Dragon II and III for the same system did retained their co-op gameplay, with the added feature of enabling or disabling friendly hits)
Edited sentence: Alternating play replaced the arcade's co-op play in the NES version (although Double Dragon II and III for the same system did retain their co-op gameplay, with the added feature of enabling or disabling friendly hits)