Easy, but fun.
You control one of the parents, and your goal is to make it through each level, avoiding all the obstacles and collecting 5 baby frogs in each level. It's a fun puzzle game, but it's kind of short lived. Most levels I was able to get through on the first try, some the second, and they're fairly short levels. That makes for a pretty quick game. There is also a two player game built in, which is basically the original Frogger.
The graphics and sounds are pretty standard for Dreamcast games. All in all, this is a fun game if you can pick it up for a few bucks.