Please post future questions pertaining to HGSS at this thread =
The HG/SS Questions Thread, not really suppose to do this...
Anywho, to answer your question though, it's simple...If you explore Union Cave & Surf, you will come to sort of a crossroads with 2 exits, both lead to the remaining puzzle rooms you speak of...
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"The Nine Tails of Subconscious - Lawence Codye"