Alternate Universes!

Now, it's time for the more spicy stuff. At level 60, you can go to the Underfell universe, where you can fight the underfell bosses there! BUT, if you go to the corners and walls behind the bosses, you can fight three bosses, but the least one is at level 2500, so you gotta wait! Next, you have dust sans, at level 125! After that, you have what used to be one of the hardest bosses, Fresh Sans! Next is Ultra Sans at level 230, Nightmare Sans at level 275, the Xtale universe at level 340! In the Xtale universe, in the left corner you can fight XGaster at level 2000, and True XGaster at level 4000! After that you can find Negatale Sans for 400 Levels, Ink sans at level 430, and betty at level 800, SANESSS at level 1500, Fatal Error sans at level 1125, Inkling mistake at level 900, and a ??? boss at level 1000! That boss is the OOF God. He is probably the hardest boss you could face at that level, due to his one-shot move. Then, you have dustrust sans at level 1250.