You could send a friend request to hazu360.
She owns the arcade verson, and has a thread where she'll help people.
I'm trying to find someone w/ the arcade cabinet version since is apparently easier from what I heard.
Your on your own. You need to achieve it in the public version. The person that stated that info got it wrong.
To say it clearly, the requirement is to get the "king mole figure" that is rewarded by getting 100,000 points in the public version of Whack-a Mole. The arcade version doesn't give you that reward. The person that stated differently didn't really read the requirement given by the tree. It's stated clearly what to do and what's needed. And the person stating it was confirmed that the arcade version works wasn't really actually done. Just to be sure, I tried it on a sub account and achieved 100,000 points on 3 modes. Didn't work.