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D&D grew out of Midwestern wargaming in the late 1960s and early 1970s, created by Gary Gygax and Dave Arneson in 1974. It set conventions for role-playing and video games.
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Hungarian architecture professor Ernő Rubik built a wooden prototype in 1974 to teach 3D movement, patented it in 1975, and saw it sold worldwide from 1980 as Rubik's Cube.
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Monopoly grew from The Landlord's Game, patented by Lizzie Magie in 1904, and spread through players before Charles Darrow sold his version to Parker Brothers in 1935.
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LEGO grew from a Danish carpenter's workshop by focusing on one precise, interchangeable brick, then recovered from a near-bankruptcy by licensing, adult fans and a return to building.
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Mattel sued MGA, maker of Bratz, claiming a former Mattel designer created Bratz while employed there. A 2008 Mattel win was reversed, and MGA won in 2011.
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