I cant speak for everyone here if they knew about entering painstaking passwords in old video games with a D-Pad and/or Joystick back in the old days, but Super Adventure Box could greatly benefit with such a feature for saving where you left off with the modern keyboard.
The password system would generate a code after youve left the Super Adventure Box without completing the level (It could simply be mailed to the player). The code would contain the necessary information for which checkpoints were completed, which baubles were picked up, enemies/bosses killed, hidden rooms exposed, etc.
Ive cracked password generators for old video games before, and I was able to find passwords from the internet/usenet days; however, with (what Im assuming we have) hidden account IDs and Character IDs, it wouldnt be all too hard to encrypt these passwords to be character specific and prevent cheaters from passing over their near-complete saves to others.
With the said, there could be other neat passwords hidden throughout the Super Adventure Box, such as unlocking a Sound and Music Menu to listen to the music and sound effect in SAB without going to that specific level.
What do you guys think about this Old School solution?
