10 Video Games That Knew What You Were Doing
6. Editing The Game's Files Unlocks The "Dirty Hacker" Ending - Undertale
Undertale has three main endings based on your actions throughout the game - namely, how violent you are - but also a number of extra hidden endings, including an absurdly specific one set aside for those who try to take a look behind the curtain.
Players are able to access the game's code with hex editing software, but if you alter any values within the code, when you re-load the game you'll be greeted with the so-called "Impossible" or "Dirty Hacker" ending.
Here, Sans says he has no idea how you reached this point, and that "you're just a dirty hacker, aren't you?," before hanging up. Roll credits.
Considering the absurdly small number of people who would ever even consider digging into the guts of any game's code, it's frankly ridiculous - and amazing - that developer Toby Fox had something lying in wait for them.