October 24th, 2005, Apogee released patched v1.0a shareware versions (and patches for registered versions) of old play-alike games Crystal Caves and Secret Agent after discovering that quitting these games under some installs of Windows XP (an operating environment that wasn't a twinkle in Bill Gates' eye at the time of these games' release) in some cases set the system clock back a century!
Like most Apogee platformers Secret Agent is actually a trilogy. The first part of the trilogy is shareware, part two & part three are not. The names of the three episodes are:
You're not just any secret agent, you are Secret Agent 006 1/2!