The Mentals_Last_Fortress.zip file you have requested: Maps Levels Missions / Map Packs / Mental's Last Fortress - 14.31mb is not available. Perhaps try browsing all files for the game Serious Sam: The Second Encounter and upload any files you want to share or are missing. This is the only information we could locate:
A Single-/Coop player mappack for Serious Sam - The Second Encounter. The first 2 maps I've created with sed1. A Single-/Coop player mappack for Serious Sam - The Second Encounter.