Chrono Trigger Prerelease
Death Peak is almost inexplorable due to the presence of strong wind in every area. However, JLukas's access codes allow it to be visited. There are three differences; an extra ascent precedes the peak, and an exit to a strange cave that lies between the Sewer location data and plays Underground Sewer exists. The cave contains a treasure chest which cannot be opened. Lastly, the peak is marred with a small, transparent square.
From: Locations (CTP)