Goo no Wakusei
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This game is titled World of Goo in North America and Europe, and Goo no Wakusei in Japan.
Easy "Subversive Traveler" achievement
Play the Chapter 2 level, "Beauty and the Electric Tentacle". Have the Beauty Goo (giant pink face) roll off the edge of the level to the left to find a secret area. Then, select the sign at the bottom.