in September 2016 for Microsoft Windows, OS X, and Linux. References External links The Castles of Dr. Creep at Gamebase 64 The Castles of Dr. Creep at Lemon 64 Castles Open source re-implementation 1984 video games Ariolasoft games Broderbund games Cooperative video games Commercial video games with freely available source code Commodore 64 games Linux games MacOS games Open-source video games Video games developed in the United States Video games set in castles Windows games