Book of Aliens’ action takes place during a global crisis. PapEarth is threatened by an alien invasion originating from below the planet’s surface. Your mission is to lead a supranational agency of scientists and military agents in a desperate but valiant fight to understand the alien agenda and thwart it.


December 5th 2019 - Book of Aliens Announced

The day has come! In the spirit of the annual update we decided to announce both Hellcard and Book of Aliens. Book of Demons was received well by Book of Demons fans. [Read more]


  • Unique gameplay mechanics that make the game simple to play yet strategically challenging and difficult to master
  • A game that respects your time and can be enjoyed in both short and long gameplay sessions
  • High replayability thanks to randomized levels and card-based mechanics
  • Beautiful paper pop-up book stylized graphics

Co-financed by the Ministry of Culture, National Heritage and Sport



About Thing Trunk

Thing Trunk is an small game development studio and a creative team behind Book of Demons, the upcoming deck-building hack and slash, where it's the player who decides the length of levels. Thing Trunk is also the team behind Return 2 Games - a series of original mid-core games inspired by the golden days of PC gaming.
More information
More information on Thing Trunk, our logo & relevant media are available here.

Team & Repeating Collaborator

Filip Starzyński
Co-Founder / Producer / Future Sax Virtuoso
Konstanty Kalicki
Co-Founder / Senior Programmer / Creative Person
Maciej Biedrzycki
Co-Founder / Chief Game Architect / Strategy Overseer
Krzysztof Rutkowski
Programmer and Linux enthusiast
Adam Mirkowski
Game designer and the creative soul of our team
Mateusz Śliwakowski
Programmer and console port fighter
Małgorzata Jesionowska
Producer. Content creator. Support. Feeds on functional bugs
Magda Leszczyńska
The first half of the art department...
Krzysztof Hain
... and the second part of the art department