License and Attribution
All source code is licensed under The MIT License (MIT).
"Atari Font" created by Genshichi Yasui is Freeware, http://www.fontspace.com/genshichi-yasui/atari-font.
The alert.wav sound by "dklon" and level_win.wav by "NenadSimic" is licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0).
The beep.wav sound by "bart" is licensed under Creative Commons Public Domain (CC 0).