I have passed the board both ways with and without the blocks. I have passed all the boards on World 3, but it will not let me go to the castle.
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Ok, so to get to the castle, you need to have the red blocks ON. A little while after the checkpoint flag, there will be a red pipe. Go into the red pipe and that is the way to completing the level and moving on to the castle.
Look lower than the first time, after the 5 ice blocks there will be a TON of red blocks going to a red pipe 50 to 100 steps to the 1/2 flag
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