Arrow Keys = Move, Get past the first FOUR attacks to spare, though each attack is long, and the fourth and final is THE FIRST 3 ATTACKS, in a row, going in this order: the hard (and long.) first attack, the annoying (and long.) second attack, the unfair (and long.) third attack. and than you win by SPARE or KILL.
You do 2 billion damage to him when you kill him. KEEP IN MIND: This is ONLY a fangame NOT representing an ACTUAL boss. undertale pococikapusta scratch my search browser my computer the company that MADE the computer etc for 8 hours.