I'm on level 48 and am using the Relic Ruins. Once you use the bomb to open the cave on the main island that's all that does. To unlock the ruins you must click the map icon that the seagull with the hat sits. That will take you to a map of islands, you must unlock Carl's Cabin which is the farthest island on the right. Once the island is unlocked, you then must collect 4 Map Key maps, which is the blue and white maps. Collecting those will earn a Secret Passage key to unlock the Relic Ruins. Once in the ruins, use hammers, clippers and axes to find hidden puzzle pieces. The only issue I'm having is once you open everything, it doesn't provide more items to find more puzzle pieces. I'm hoping that will come, if not I'm stuck. Haha Hope this helps!!