Follow the old people (caused by closed source) using the Linux pinguin and make them younger (by going through them), pay attention to proprietary enemies blocks (which do not play a fair play).
Enjoy the game!!!!!!
Opensource quest is based on SDL and some of it's extensions :
$ sudo apt-get install libsdl2-dev
$ sudo apt-get install libsdl2-mixer-2.0-0
$ sudo apt-get install libsdl2-ttf-dev
$ sudo apt-get install libtinyxml2-dev
$ make
$ ./openquest
Have faith in opensource!!!!!!!!!!!!