Type a 40-year-old sequence of keystrokes on a specific Bank of Canada web page about a commemorative 10 dollar bill and the site starts playing an 8-bit version of the national anthem while tiny banknotes rain down your screen. This episode explains how up, up, down, down, left, right, left, right, B, A got there. In 1985, Konami developer Kazuhisa Hashimoto was porting the arcade shooter Gradius to the NES, could not beat his own game during testing, and programmed a shortcut that granted a full set of power-ups. He forgot to remove it, and because NES games were written in tightly packed assembly language, deleting it at the final stage risked breaking everything.

The code exploded with Contra, where it turned three lives into thirty and democratized a brutally difficult home port. Konami embraced the mistake as a brand signature, and later developers used it to toy with players: Gradius Galaxies self-destructs your ship, Bioshock Infinite unlocks 1999 mode, Hollow Knight Silksong unlocks permadeath, Bloodstained unlocks a deliberately stiff 1986 mode, and Anno 1800 spawns hundreds of flying animals. The hosts then follow the code out of gaming entirely: Siri, Google Assistant, Alexa’s super mode, Discord’s 404 page, Netflix, Facebook, the WWF’s spinning panda, Marks and Spencer, Wreck-It Ralph, Fisher-Price toys, and a 2001 song by The Moldy Peaches.

• Why removing ten inputs from a 1985 NES game was like pulling scaffolding out of a finished skyscraper
• How arcade-style difficulty made 30 lives a necessity rather than a luxury
• Why modern developers hide harder modes behind a code originally designed to make games easier
• The Castlevania Legacy of Darkness variant that went undiscovered for 25 years
• The code as a digital shibboleth, and whether instant patches mean no accidental legend like this can ever be born again