I had an Application I used a lot with kids in my family that ran on the Power PC Mac. It was an interactive Alphabet program by the Learning Company with talking cartoon Characters. 2 through 5 year olds loved it. It was based on a Dr. Seuss's Book about the ABC's. Every letter was covered. The child could spend large amounts of time exploring each letter and little talking animations would come up. I upgraded my Mac laptop to Mavericks. Now the program will not work and there never was an upgrade of the program. How can I undo Mavericks and go back to the way my Mac used to be? I want that Power PC program back worse than an upgraded Mac. Find me an ABC Program that Surpasses this Dr. Seuss program and I might reconsider downgrading. Can you please help me?
A simpler solution: you may be able to run Snow Leopard in a virtual machine. A quick Google shows that running Snow Leopard in Parallels under Mavericks should be possible. Here's the first link I found, for example.
First, a sidenote, but of importance: You cannot restore a Time Machine backup from Mavericks to Snow Leopard. You need to back up your data in a different manner before rolling the OSX back.
With the risk of providing an answer which is both brief and externally linked, there is an excellent user tip from an ASC member for how to revert OS X back from Mavericks. This guide includes reverting back to Snow Leopard directly from Mavericks, which is what you're looking for. It's clear, detailed, and exactly the type of step-by-step guide I advise following.
I had a similar issue - tried 10.8 on an 2010 MBP. In the end, I had to re-install the older OS, because Apple does not see that any user should ever want to go back from the latest version.
If you have an external USB volume, either put the new system on that and install 10.6 on the PB (note: You must manually select Rosetta, by default it will not be installed!), or install 10.6 on the USB. Use the Control Panel "Start volume" to select which to boot from.
10.6.8 has become Apple's Windows XP. There are lots of good reasons not to upgrade.