- Metal Slug 8 (Ratbrute), an old game idea created by Ratbrute, the former leader of this wikia before he left
- Metal Slug 8 (AStranger195), a much newer idea from the only currently active sysop AStranger195. While it is missing some parts, such as its plot, its formatting also adheres to Game Ideas Wiki's standards.
- Metal Slug 8 (TheProjectXZoneFan1997), the difference between the previous ones is that some Metal Slug Attack characters has become canon, as well as we have new enemies and a new organization, this is also the first canonical Metal Slug game to feature all PF Squad soldiers in one game.
- Metal Slug 8 (Lord Moogoo), this expands on Metal Slug 7/XX portal idea of different soldiers from different timelines, along with new weapons and characters. Currently, the plot and weapons section are completed.