GOG version: https://www.gog.com/game/the_deadly_tower_of_monsters
All extra content included.

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Patch 1.05 (24th October 2016 on GOG)

- New Survival Mode! Battle through increasingly difficult waves of Sci-Fi creatures to earn credits for upgrading your weapons and powers. The deadliest challenge awaits!
-New achievement!

Bug Fixes:

-Fixed local coop problems with progress / save data and menu when starting with player 2 in a game session