Quark/Hadron

"What is Hadron ?
Hadron is a think-shoot-them-escape game. You will have to face many intelligent bugs and evil people to exit this terrific electronic world.

Level Editor
A powerful level editor is included with Hadron. You can create as many level as you want and play with them.

If you would like Hadron to include one or more level that you've created, just send me the level file and I'll include it in the next version of Hadron. I don't guarantee that all level will be included. Also, level may be subject to change before being included into Hadron.

Shareware
Hadron is a shareware and costs just 10$. Hadron needs no registration to work (you can use it without paying the shareware fee, but if you like this game and want to support the shareware method and great products for MacOS X, please send the shareware fee ;-)).

(...)

History
October 21, 2003 - version 2.1
Quark has been renamed Hadron for legal reason ;-).

April 1, 2002 - version 2.0
Completely rewritten in C++ and optimized for MacOSX and MacOS Classic using CarbonLib.

July 5, 1994 - version 1.0
Initial Release."

Source : website

Screenshot's source : Macintosh Repository