There are 2 endings 1) You defeat the SANS, [its hard i get it but its possible.... I have done it and some others guy did too....] there are some tricks to do that too, like if you go in left most corner it becomes easy to dodge arrows....or there is a point in game where if you stand no one shoots you [basically if enemies arent in your camera...they cant shoot you...thats how it works] 2) This is intended ending, here you have to TRY 10 TIMES to fight SANS BOSS, like DIE 10 TIMES in that boss battle, if you do so something special happens [go try yourself].....btw i mentioned 2 endings in description of game i think u didnt read that