Rick has sent you back to slenderman from a different universe. this slenderman is atleast ten times more powerfull. you try running as the ground begins to shake. but he outruns you. you have to fight him once more to escape new controlls (pc only for now) space for superspeed. down arrow for crouch
okay for you all not understanding the complete story basicly morty was wlking in the woods when he stumbled upon slenderman. in the first game he tried to escape him but that didnt really work so in the second game he tried and killed slenderman. then he went back on his way to home in the third game only to get betrayed by rick and get sent to a alternate universe where slenderman is even more powerfull. morty also became stronger because of his experience against slenderman.