I didn't know whether I could visit the Ogre Cave for my Lithium Man attempt. Turns out I couldn't. I actually Googled whether or not I could enter it, considering it is part of the Caverns of Chaos. Either that or the Lithium Man achievement is broken. I am assuming it was just silly on my part. The current wording is:

"Complete the game without ever visiting any locations other than the Caverns of Chaos and the Tower of Eternal Flames"

I would like to see this amended to:
"Complete the game without visiting any locations other than the Caverns of Chaos and the Tower of Eternal Flames. The Ogre Cave and the Blue Dragon caves are off-limits as well."

Not that I visited the Blue Dragon's caves, anyway.

Other suggestions:
- Make a 'challenge game' format other than weekly challenge that allows you to choose the <metal> man mode you require, then have the game warn/kill the PC once it deviates from the postulated challenge
- Add a key you can press in the achievement list to get more information on challenge games

All that aside, I should have known.