Fun but not as satisfying as the Asteroids egg that lets you blast the text appart, does that still exist somewhere? There was a hammer one as well, it let you crunch your poorly ranking SERP entries, lol.
I haven't seen them in years but am sure the egg code is still in the wild.
Anyway, I'm sure this helped sell a few copies of Splatoon? I'd rather write another game in PEEK and POKE on the VIC-20 than pay for a game but I still have 50 lifetimes of free games to try and enjoy building stuff more.