Can anyone remember Volcano? It had a similar look to Hungry Hungry Hippos, with the players based around a round play area, but with a Volcano rising up in the centre of it. The aim of the game was to build your Temple bit by bit, each person adding a ball into the centre of the Volcano, which once it reached a certain weight would spring up sending the balls down the side and knocking the Temples over. The winner was whoever had the most intact Temple after the explosion. I loved it!