The 2014 Tomb of Twelve Demo Tomb 1 Now for Linux too, in addition to the PC Windows and Mac OSX10.5 or higher demo download. The demo version includes a day/night cycle and an early version of the game. The full version currently in development is planned for Winter 2014.
Demo Features include:
Several creatures to contend with and avoid
Several traps throughout the first Tomb (early design)
Sleep to recover lost life
Old Man Guide gives tips
Completion of the demo will reveal more features planned for the full game.