X-23 Available in Marvel's Avengers Alliance

In the Playdom created Marvel's Avengers Alliance social network game, X-23 is available as a selectable (once unlocked) character to add to your team.  She costs 135 command points to unlock and can be found on page 7 of the team listing.

Her attacks include the following:
Snikt! (In reference to the sound her claws make)
Blades of Rage
Made for Walking (Song reference to "These boots are made for walking" that was originally written by Lee Hazlewood and recorded by Nancy Sinatra.)
Assassin's Strike

She also includes two passive skills.
Healing Factor, which restores part of her health each turn and Triggerscent, which marks a target for additional damage or action alongside Berserker Rage and Enraged.

She is featured heavily in Season 2's Chapter 2: Crazy Eights.  She's in the 2nd Mission which is called 8 Fingers.  Though she is presented out of character to her 616 counterpart.

The game started in 2012.  It is a turn based strategy game that also allows pvp.  It contains a story mode with a high amount of chapters and seasons.  You create your own S.H.I.E.L.D. agent and build your team to level up facing various villians from throughout the Marvel universe as well as other players/agents on occasion.  For many characters there are an assortment of costumes or skill sets that can be unlocked.

There are also timed exclusives too.  During many major Marvel events or movies, various other unlockables are added in.  The Phoenix 5 from Avengers vs X-Men were briefly available as well as various armors from Ironman 3.

Currently Spiral is the next character to be added.  She will start off by featuring her Uncanny X-Force costume.  A Thor event should also be around the corner for his upcoming movie.

The game can be played on mobile devices or on Facebook.  They also offer a downloadable app version as well.