10 Video Game Secrets That Unlock FULL Video Games

10. Ninja Gaiden (2004) - Ninja Gaiden 1/2/3

It wouldn't be too much to say that Ninja Gaiden really hit its stride with 2004's reboot. Forget your "like Dark Souls" tagline, this was the original controller breaker.

A strict and unforgiving action game like many hadn't seen before, outside the likes of Devil May Cry and God of War, Ninja Gaiden had a point to prove: get good.

Paying homage to the unforgiving platformers that in turn gave life to this also unforgiving franchise, you can unlock the first three Ninja Gaiden games to get your nostalgia fix.

And in keeping with the hard as nails theme, they aren't easy to unlock.

To start with, you have to collect fifty of the hidden Scarabs dotted about, which is no easy feat. That unlocks the first game. The other two require some fiddly platforming and precision aiming, which sounds pretty easy compared to the scavenger hunt.

But by the time you unlock them all, it feels like self-flagellation: do you want to continue the difficult main game, or stir up some retroactive rage with the early games?

Hmm, tough call...