Favourite side-scrolling game.

Wondering what peoples favourite side-scrolling games are? Being a huge Mario fan my number 1 is probably Super Mario Bros. on the NES which I used to get to play when my friend stayed up the street from me with his grandparents, good times :)
 
Agent Sam was pretty awesome too.

Any 2D Mario games

OOPS!! Forgot to add that things like Hotel Mario are not included.

Lately - Castle Crashers
All Time - Bonks Adventure

" Metal slug, 'nuff said. "

spelunky

Mega Man 3

On Amiga : Turrican II
  

Another vote for metal slug. It's a quarter devouring beast

Mega Man X. 
 
@sidescroller said:

" The correct answer is Mega Man 7.  

Side scrollers are awesome. Make more 2D side scrollers, please. Super Metroid, maybe. Metroid Fusion was also pretty damn good. But... Shadow Complex. Yes, right there.

lode runner

Donkey Kong Country 2. :]

Metal slug 2.

Shadow Complex
 
used to be Golden Axe or Metal Slug

  Cho Aniki! ;-D

Castlevania: Symphony of the Night.

" Castlevania: Symphony of the Night. "

Soldat

There are lots of good mentions so far. I would like to add 'Splosion Man. That is a great recent side-scrolling platformer.

 
Contra!

Mario and Castlevania series are probably my favorite. I do like Metal Slug, but the series is way to hard for my liking unless its a MAME rm and not playing with legit credits.

"

"

Commander Keen would like a word with you gentlemen... 

Castlevania Symphony of the Night is still the shiznit.

commander keen

metroid fusion