Serious Sam 3: Jewel of the Nile

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Serious Sam 3: Jewel of the Nile follows the legendary hero to the mysterious Temple of Isis on the Island of Philae where a monstrous temple guardian lies in wait. Set in the midst of the events in Serious Sam 3: BFE, Sam and his team will battle through three new campaign missions against the unrelenting hordes of Mental’s forces.

Key Features

Three new massive missions set against a mysterious island, treacherous canyons, and ancient temples!
Battle against the powerful Aludran Reptiloid for the first time in Serious Sam 3 and face-off against an all-new gargantuan final boss!
More laser rifle? More sniper rifle? A new battle axe? You got it!
New challenging Steam achievements!