Puzzler is a puzzle game for Mac OS 7, 8 and 9, released as shareware in 1998. It runs fine under Mac OS X Classic, but (depending on your views) could be considered showing it's age...

Puzzler is no longer sold as shareware, you can register it with the name "Puzzler" and code "1054".

You can download Puzzler 1.0.3 as a StuffIt archive (120 kB).