Thanks for the positive comments guys.
There is alot to this game, more to it than first meets the eye. I found a link that i checked out to learn more about the game.
http://www.ipdb.org/rulesheets/3780/congo.htmThe author has gone to alot of effort with his write up. Collecting diamonds and completing missions to lock balls in the volcano is a blast. The audio is t'riffic turned up and the dot-matrix display is full of excellent animations. The WPC package had excellent dot matrix graphics which appear to be very complex to previous Williams Dot Matrix artwork. ? More pixels used or something. My 12 yr old daughter and 2 yr old son love the Gorilla in the hidden playfield. They think it is way cool.
The link above/below shows how much detail can be found on the game. Heaps of stuff. Have a quick look.
http://www.ipdb.org/rulesheets/3780/congo.htm