SNK's classic shooter Metal Slug X has been listed on Steam, and it's due October 2.
The 2D runner-and-gunner comes with the original six mission arcade version of Metal Slug X which improved gameplay and fixed a few technical issues in Metal Slug 2. The Steam version of the game will feature a mission select and support online co-op play.
Metal Slug X will cost $8 USD, but you can pre-order on Steam to save 25%. Nifty.