Tom Clancy's Rainbow Six: Critical Hour XBOXRainbow Six Critical Hour's storyline bids on nostalgia as John Clark retires and passes the torch to Ding Chavez. Chosen by fans, eight single player missions from the original Rainbow Six and Rogue Spear games return, revamped with today's technology. Return to tactical gameplay: Through slower pacing and an enhanced combat model, strategic planning is the central element of gameplay.