Extreme 4 Reganl - Max Hardcore

Putting this together, maybe the user is referring to a Max Hardcore game that's part of the Extreme series, the fourth installment, featuring the character Regan. However, I don't recall an "Extreme" series in Max Hardcore titles. The official titles are numbered up to Max Hardcore 6, maybe? Or perhaps the user is referring to a fan-made or lesser-known entry.