Didnt they say it will be multiplayer?

I saw only two endings. The one where you get into the car after going to -6. And the one when you get into the elevator and you die. I saw on a YT video that there were 4 endings. Can somebody tell me which endings I am missing ?

Seems to be happening a lot. There is one challenge where there is a void and the only way to go back up and open the door is to go into the void. That always seems to result falling off the map. Now I've just restarted the game after the elevator ending, and the intro also has me off the map. wtf?...

Everyone is talking about the -6 levels after you hit 0, but I ended up back at 50 instead of a negative number and all the lights were off which made everything a hundred times more difficult and frustrating. Any ideas why some people get negative numbers and some are sent back to 50 with the lights off?...

What a load of ♥♥♥♥, steam needs to get rid of the f2p category is full of crap