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This level is by far the hardest Underground, it has the Secret to Valley Fortress which leads to the Back Door to Bowser's Castle....On the 3rd Screen of the level, there is a spot you have to run before the Yellow Ground squishes you, when your at the end and the ground has came up, jump on the yellow ground at the end, then go left for a LONG or short walk till you see a Key, thats your time to face the Hardest Fortress! Also if you have a yoshi with you there is a box in the level which releases yoshi wings for a secret bonus area!