World of Goo is a physics based construction game,
where you try to get the Goo Balls to the suction pipe by building
structures out of them. The Goo Balls are rumoured to be delicious, but
there doesn't appear to be any way to test this. The game costs money,
but the demo is long enough that it's worth a play. Hours of fun
&c... It's funny in a quirky way (each level has messages left by a mysterious "Sign-Painter") and the game physics are subtle yet effective, which is generally the ideal.

World of Goo demo
downloadTower of Goo unlimited is a sort of concept version of World of Goo where you try to build the highest tower with the Goo Balls. It's free.

Tower of Goo unlimited
download
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