When you think of classic coin-guzzling '80s arcade titles then Capcom's Ghosts 'n Goblins will surely spring to mind. Tokuro Fujiwara's classic 1985 side-scroller was insanely hard and incredibly popular, and was ported to pretty much every home format going - including the NES.
Ghouls 'n Ghosts followed and boasted better visuals, improved controls and a difficulty level that tested players - the subsequent Mega Drive port ensured that domestic gamers didn't miss out, either. The SNES exclusive Super Ghouls 'n Ghosts took things to the next level, and would later be ported to the Game Boy Advance.
These are just a handful of the titles which make up the entire lineage of this series, and if you're hungry for more info then check out the latest video from Slopes Game Room. It details everything from the early origins of the franchise to the more recent PSP and mobile phone outings, and is well worth a watch.