We already know Batman, Robin and Catwoman will be playable in this month’s Batman: Arkham City, but a new achievement suggests that a fourth player, Nightwing may be added to the mix.
The achievements, as seen above from http://arkhamcity.co.uk seem to be pretty cut and dry, and point to Nightwing being unlocked via DLC for the game’s challenge maps.
For the uninitiated, Nightwing is original Robin Dick Grayson all growned-up and adult like.
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