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Despite initial reports by Ubisoft saying that there would be a single player campaign for Rainbow Six Siege, the latest official word is that it will not include any such mode.

Siege's Art Director Scott Mitchell delivered the bad news at this year's EGX.
“There is no story mode per se. You go through training, where you get to experience different operators and their devices. You can play against enemy AI in co-op through all the maps. You can customize matches, so that’s what we’re offering on the single-player side of things.

It’s a pretty good training ground, and on top or that you’re unlocking the same content as you would playing in PvP. You’re still gaining stars, renown points, and new operatives”

Keep in mind that the following is what Ubisoft had originally planned for the game as far as single player is concerned.
After years of dormancy, the Rainbow program has been reactivated by a new Six (voiced by Angela Bassett) to combat a new enemy known only as the White Masks. You have been called on to assemble an elite team of specialists from counter-terrorist units around the world, and in Rainbow Six Siege, you will recruit these Operators through various missions, by playing any mode and gaining renown.

The White Masks are a relative mystery. Their motives and goals are unknown, but we do know they have no qualms with taking innocent lives. “We don’t know what they want, but they are wreaking havoc all over the world,” says Witts. “Rainbow is the taskforce called in to take down this threat. It’s up to you to rebuild the program under Six’s direction.”

“The single-player is really about the player’s story, and the player’s impact on the Rainbow Six universe,” continues Witts. Rainbow Six Siege is bringing us back to the scenario-based missions from previous Rainbow titles. Each scenario is designed with single-player in mind, though all of them can be played in co-op. As with the Hostage Rescue mode revealed at E3 last year, there’s no respawning; if you go down once, you’re down for good.

Unlike Call of Duty: Black Ops 3 on old-gen consoles, Rainbow Six Siege is still priced at $60 (USD) across the board.

(via DSOG)