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The "Moai Statues" of real-life Easter Island show up in a number of Konami-made games, the most notable examples being across the Gradius series, as well as in the Metal Gear series.
Contributed by G-Haven
Konami formed Ultra Games in the US and and Palcom in Europe as a way of circumventing a Nintendo licensing policy which stipulated that each third-party could only release 5 titles per year for the NES. With an extra publishing arm, Konami was able to publish 10 titles per year.

Their hold on a trademark for "Ultra Games" would later prevent Nintendo from using the name "Ultra 64" for one of their consoles.
Contributed by Spherix
The infamous Konami Code was made by Konami programmer Kazuhisa Hashimoto after failing to beat Gradius on the NES. He programmed a simple code into the game that gave him a full set of power-ups, which allowed him to play test the game to the end.
Contributed by DidYouKnowGaming