Pong and Space Invaders are two of the most beloved old-school arcade games of all time. Ikaruga and Portal both often make the short-list of modern classics. So what do you get when you combine Pong's bouncing, Space Invader's baddies, Ikaruga's polarity shifts, and a decent dose of Portal's plotting? ReflexION by FreeSparkGames. And while it might not be included in the gaming hall of fame like its inspirations, it's a more than worthy way to pass an afternoon.