I don't remember whether blasting the lighthouse wall at that point was critical to advancing the plot. Holding on to the last bomb so you can use it on the east wall (and satisfy your curiosity) might be worth reverting to an earlier save. But I doubt that there's anything (currently) in the next frame that would meaningfully enhance play during this update. There's a decent chance that Clare will blast it for us in the next update. Since the rock bomb instructions are still laying around, we'll have the opportunity to build another.I sqandered my fourth bomb in the cellar of the lighthouse to blast through a wall I could have broken with the pickaxe. Do you have to pass the big rock in the new chamber with the rock puzzle? And if so, is it possible to make new bombs, or do I have to go back to an older save?