GOG is currently offering Ziggurat for free and you just need to create a free GOG account for you to be able to avail of the free game. The game is yours forever once you redeem it but the offer is only for a limited time. This promo will end on June 13, 2018, 1PM UTC. Games at GOG are DRM-free which means you can play it without having to connect to the internet for game ownership validation.
Ziggurat is available on Linux, macOS, and Windows.
Enter the labyrinth and face dangerous challenges to prove your worth and become a powerful wizard!
Smooth and quick First-Person-Shooting experience
Plenty of equipment and perks to keep you entertained for ages!
Skill-based dungeon crawling, with random generation and permanent death
Here is our game play video on Ubuntu MATE 17.10 using a Radeon RX 580 8GB. Ziggurat runs flawlessly on Mesa 18.0.1.