Nintendo's Metroid Prime 3: Corruption for the Wii is full of secrets, but some of those secrets are buried deeper than others.  Sure, you found all of the energy tanks and weapon upgrades, but did you discover the secret messages from Satoru Iwata, Shigeru Miyamoto, Yoshio Sakamoto, and other key creative people who worked on the game?  You'll need to input special commands on a control panel inside Samus Aran's gunship.  Think you can strike on the solutions at random?  Good luck!  There are 1,680 possible combinations to try and only five correct answers. The Metroid Database has the information you need to unlock these secret audio transmissions.  The catch in all of this?  You'll need to be able to understand Japanese to get the most out of it.  Fear not though!  The guide also includes English translations.

Hello everyone, this is Sakamoto from Nintendo. Have you been enjoying Metroid Prime 3: Corruption, the final episode of the Metroid Prime trilogy? You have been enjoying it, I hope? Samus’ missions will still continue outside of this series. Please keep waiting for them. So, please look forward to the next Metroid. METOROIDO...OMOROIDO. [Metroid is fun!]

I love when games include little elements like this (even if I can't understand them nor have any hope of stumbling upon them).  I found the control panel in question when I played the game when it first came out, but never did find the purpose for it.  How would anyone even know to look for these messages?  Or which buttons to press on the panel?  I suppose the best secrets are buried deepest of all.