Junjun and i are currently engrossed in a PC game entitled “World of Goo.” From wikipedia, here is its description:
World of Goo is a puzzle computer game with a strong emphasis on physics. The game is built around the idea of creating large structures using balls of goo. The main objective of the game is to get a requisite number of goo balls to the pipe representing the exit. In order to do so, the player must use their various abilities to build bridges, towers and other structures to overcome gravity and various terrain difficulties such as chasms, hills, spikes or cliffs.