From the author of Knossu himself here <a href="http:&#x2F;&#x2F;jonathanwhiting.com&#x2F;games&#x2F;knossu&#x2F;press.html" rel="nofollow">http:&#x2F;&#x2F;jonathanwhiting.com&#x2F;games&#x2F;knossu&#x2F;press.html</a><p>&gt; <i>[Knossu is] an answer to the question: What can you do with a Doom style raycasting engine if you&#x27;re tired of realism and shooting things?</i><p>So it&#x27;s a Ray caster.  Which you can confirm by playing the game and looking up and down: the distortions are typical of a ray-caster.<p>Too bad you&#x27;re using an old GNU&#x2F;Linux distribution.  For the record, it worked out of the box for me (Debian Testing, 32bits).