What is the hardest game?

[SHMUPGurus]

I have no idea, but Bionic Commando Rearmed's last stage on Hard is fricking... Hard! I can't imagine it on Super Hard. I have to admit that I did miss a couple of weapon power-ups though... So f those turrets!!! /rant

I'm guessing pretty much all Shoot 'Em Up games are the hardest ones out there. Especially games from the Gradius and R-Type series, and horizontal SHMUPs altogether. Gradius III is definitely the hardest of them all though (the Arcade version at least, so damn cheap).

I recommend you check this super play of the game, you'll see what I mean about that. Don't forget, the guy is pretty good. Imagine you're the one playing, totally different story:

http://super-play.org/files/GradiusIII/BGR44/BGR44_GradiusIII_Round1allclearanddigest.wmv