Zero Point Software released the PAX co-op demo for gamers who have opted for the Spearhead option which means they get to sample some of the gameplay elements from the forthcoming co-op game which releases next month on the 18th September (although the demo is not the same as the planned co-op release). With some tense moments against killer bots who frighten would be marines, the game is pretty solid and has plenty of jump out moments. Take a look at our Interstellar Marines Co-op gameplay videos which feature SOLO and CO-OP playing. You can find out more about the game by heading on over to the Steam Store Page Here.