This is an SDL based Open Source maze game available from http://sourceforge.net/projects/chrzaszcz/. It is a beta version. The license is GPL 3.0.
In chrząszcz you are walking through a maze. The whole maze is divided into chambers. In order to go to a different chamber you must open a door. In order to open a door you must have a key.
To open the door you sometimes need to exchange the keys with the orcs living here. Do not be afraid, the orcs are friendly and they always allow you to reverse the transaction. But sometimes they will not give you anything. You must figure out which keys combinations they would be willing to exchange.