Ghostbusters

Like the rest of the game, this level is pretty easy - but to make the final boss even easier, simply stand in the top left hand corner and Rowan can't even hit you, but you can hit him.



From this position, Rowan can't hit you, no smaller ghosts will attack you. After a few minutes of hammering to fire at Rowan unattested, he'll be defeated without any trouble. Easy!