It's "The ice cave" for everyone wondering.The ice cave was a standing challenge back from 2010 where the goal was to reach The Ice Cave Cutscene room found outside of the Tribute Room Easter egg. The cut scene room was thought to be another part of the Easter egg, but that turned out to be false. Therefore we set out to get inside the Ice cave by tricking means. Enjoy! ;D
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That is really cool that you found a way inside. Pretty amazing. :D