There are 10 types of people in this world, those who understand binary, those who don't, those who thought this joke was in binary, and those who realize it works for any whole number base.
Try decoding the 'savegame' format from Lord Of The Rings for Super Nintendo, from the year 1994.
It's not even a battery backup save, you gotta manually write down 48 characters, then manually re-enter those 48 characters when you want to restore a 'savegame'
Turns out it's in base 32 format, and uses the CCITT CRC16 hash algorithm to verify the data integrity.
Guess what? If you punch in 3P53P53P53P53P53P53P53P53P53P5
You start off with all the characters maxed out (prolly more maxed out than intended), and also bypasses the checksum, as it zeroes out.