Lego Batman, like all Lego games, is absolutely loaded with references and easter eggs. As well as recreating memorable scenes from the Dark Knight's storied history, it is packed with geeky, niche in-jokes. One such easter egg requires a Commodore 64 to actually make sense of.
As pointed out by Cabelsa over on TikTok, when Batman analyses something on his computer in-game, a short splash screen pops up to signify that the computer is booting up. Turns out that screen isn't just for show, as Cabelsa points out: "Did you see that? Did you catch that? Back up. That, my friends, looks like Commodore 64 BASIC."
Effectively, the 1982 8-bit Commodore 64 (otherwise known as the C64) required its users to know some code in order to get it to function, and BASIC (Beginner's All-purpose Symbolic Instruction Code) is the language used for the machine. Think of the modern Terminal you find in Windows, imagine having to use that all the time, and you have a decent idea of how the C64 functioned.
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