Nintendo has updated the Virtual Console with three Halloweeny games for the NES.
They are Devil World, Castlevania III and Ghost 'N Goblins, all of which cost 500 Wii Points, which is approximately GBP 3.50 / EUR 4.50.
The latter duo need no introduction (and don't really need buying either, since you can get the SNES Super Castlevania IV and Super Ghouls 'N Ghosts for 800 Points each), but Devil World might have passed you by.
Originally released 24 years ago this month, it's a Pac-Man-esque maze game designed by Shigeru Miyamoto, in which players control a cutesy dragon who collects crucifixes on a quest to kill the devil. In hindsight, it's rather amazing it never came out in the USA.
We can think of better Halloween-related ways to spend tree-fitty, but we can think of nothing amusing upon which to conclude this paragraph.