Major Nelson has posted to his blog regarding the recent info floating around about the hack involving the Kiosk disk.  Here is what he had to say:

There was some misinformation floating around last week that I wanted to clear up. Specifically, that folks are cheating at Hexic and earning achievements or getting high scores that they got by cheating. I got an email from the Xbox Live Arcade team where they told me:

“We’re seeing reports of people hacking Hexic HD using the European Kiosk disk hack. The truth of the matter is that we actually removed the code from the kiosk version of the game that awards achievements and Gamerscore and posts high scores so the reports are false. While Hackers can play the game and trigger the achievement awarded animation as if is still there but they don’t actually earn anything since they can’t connect to Xbox Live.”

So there you have it, keep working on your high score in Hexic with complete confidence that the folks above you earned their way to the top.