Undertale (Toby Fox Prototype)
Undertale went through several changes through it's development by Toby Fox, a beta version of Undertale was made by Toby Fox around the middle of 2014, to say the least; it had many changes from the final game and it didn't have a Mercy button, therefore setting it permanently to a Genocide Run.
The original version originally meant for you to kill everything, like standard JRPGs.
Toby uploaded this version to a torrent website undergoing the name "TF"
Fortunately, the version was up for one more day until it was eventually taken down, I downloaded it before it got removed and attempted to play it, just to see what Undertale would be like.
First of all, Frisk's beta sprite had a Ness-like shirt and blonde hair: (shown here):
Some enemy sprites were changed to their Hard Mode counterparts and sometimes weren't, it seems that during the development there was a bug that switched sprites.
As for how far the story goes, it gets up to Snowdin and then the game crashes.
Through the world of hacking, I found out that there was another bug that crashed the game once you left the Ruins, I removed it and finally was able to progess some more.
I got to Papyrus and Sans' house, nobody was there, there wasn't even a meeting with the two before that; just nothing...
I walked further and there was a door that was floating in mid-air, I used it and suddenly, I was in a black room.
I walked more and more, until I eventually found Papyrus mourning over the grave of his brother, I was shocked, so very shocked.
"HUMAN! LET'S JUST GET THIS OVER WITH!"
I then engaged with a battle with Papyrus, his battle sprite looked like this:
The text box then flashed at me:
"Papyrus no longer believes in you..."
Papyrus made all of my HP drop to 1 in a gigantic attack, "I AM DISAPPOINTED WITH YOU HUMAN..." he said.
"S-SANS WAS T-THE BEST BROTHER I EVER H-HAD..."
Papyrus finally finished me off with another attack.
Oddly enough, the game didn't show me a game over screen, but rather to a cutscene; showing Frisk on the ground, bleeding to death.
"Y-YOU KILLED MY BROTHER! NOW YOU WILL SUFFER THE SAME FATE AS HIM!"
Papyrus took the weapon I was equipped with and SLASH! The screen went black and showed me a game over screen.
I played it over and over, just to see if I can try and avoid Papyrus' attacks, I always failed.
Since then, I have deleted the files off of my computer for good.
UPDATE: Ripped Papyrus' battle theme:
https://www.youtube.com/watch?v=c20P6cdxdMg
UPDATE 2: The song that played when I was walking around an empty Snowdin:
