I was requested to provide my entry for the 20 Event Competition in 2011, since the Gamebuilder site went down and it is no longer available there.
It's open source and includes two arcade games: one is a pseudo-3D breakout game, the other is a 4-in-a-square Bejeweled-style game.
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If you like Orb, try playing Please login to see this link., where I further developed the 20-event-game to a highly varied flash game.