Ok, I'll tell you. so in another version of US (Underswap), You need to collect a few stone things, and you can free Blue along the way. when you get to a boss fight, you might notice something... "odd" with Blue's stats. once you get to the Ruins with Asgore and go to sleep, you wake up and you can get Blue up to. and once you do you will hear his quote of the year being: "Give Me 5 More Mwehnutes". After you wake him up, you can go back leave the room, and go else where, once you come back to check on Blue, you will see, as I quote, "ketchup" everywhere. if you go to yours/Blues room, Blue is gone. go to the kings room and He'll be dead, from Blue. afterwards Blue will chase you and begging you to stay, but to much dismay if you don't get the keys and leave out the door quick enough, he'll kill you. after you escape him for the moment, run run RUN, It'll end at the start of Snowdin Forest. Watch Merge's Let's play of it to find out more.