In the World of Goo you use goo as construction material and have to build various structures, bridges, cannonballs, bridges, towers and various others in order to proceed further.
The amount of goo is limited though, so you must use only as much as needed and the faster you complete a level the higher your score will be.
You will encounter a few obstacles throughout the game such as fire and rotating blades, so you have to stay alert all the time.
You will receive a few hints while you play as well and that should help you advance faster.
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