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10 Apps to Prevent the Summer Slide

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World of Goo

In the World of Goo, tiny goo balls are looking for a safe passage through—and it’s up to budding physicists to make it happen! This science-centered puzzle game features a slimy landscape, full of dangers for the poor sludge balls looking for safe passage to oil-slick pipes. Sound easy? It's not; build bridges or towers that are too narrow and the constructions will collapse.