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https://tcrf.net/The_New_Tetris
http://kotaku.com/5987211/a-halo-easter-egg-that-took-years-to-discover
https://motherboard.vice.com/en_us/article/d7ydz7/it-took-33-years-for-someone-to-find-the-easter-egg-in-this-apple-ii-game-gumball
https://www.geek.com/games/nes-punch-out-easter-egg-took-29-years-to-discover-1651969/