"Captain Bumper" runs on any PowerPC or Intel - based Macintosh: iMac, Mac Pro, MacBook, PowerMac's etc... BUT UNTIL Mac OS 10.6 (will not run on Mac OS 10.7 , 10.8, etc.)
"Captain Bumper" runs on Mac OS 8.6 or above (Mac OS X supported in native mode).
"Captain Bumper" needs at least 64Mb of free built-in or virtual memory.
After download under Mac OS 9.x , if the file will not expand automatically, you may first need to download Stuffit Expander 6.x or greater from Aladdin Systems, Inc. at http://www.stuffit.com/mac/expander/index.html