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General Analysis:
http://www.atarimania.com/game-atari-2600-vcs-pengo_18304.html?version=18304&AWPID510833C0=196AF78D4CBA562BBE472F382D16E817F77EDCEB
https://www.arcadeclassics.net/80s-game-videos/pengo
http://www.system16.com/hardware.php?id=688&gid=3239#3239
https://www.giantbomb.com/pengo/3030-4196/similar-games/
https://es.wikipedia.org/wiki/Sega_RingWide
https://gamicus.gamepedia.com/Arcade_system_board
http://adb.arcadeitalia.net/dettaglio_mame.php?game_name=jrpacmbl
http://www.hardcoregaming101.net/pengo/
https://downloads.khinsider.com/game-soundtracks/album/pengo-arcade-soundtrack
https://www.spriters-resource.com/arcade/pengo/