Dying Light - Hellraid is a full version action game developed by Techland. It is an add-on to the Dying Light game that takes you on a journey to another realm through an eerie arcade machine found in the Tower's basement. The game mode is based on Techland's first-person fantasy slasher Hellraid.

In this game, you will hack through hordes of demonic enemies with medieval swords, axes, and hammers. You will explore stone corridors and dimly lit chambers of an otherworldly stronghold that is overrun by servants of Hell. The game offers an intense and rewarding experience, and you can pick up bounties for additional prizes as you revisit the fortress.

You can play the game mode alone or with up to 4 people. The challenge increases as you face unholy forces that match your numbers and strength. Improve your Hellraid rank to access new weapons that you can also wield outside of the infernal realm.

Overall, Dying Light - Hellraid is an exciting and challenging game mode that offers a unique experience for players who enjoy hack-and-slash games.