Sun, surf, and shoreline — the "coastline" tag gathers puzzles that evoke beaches, cliffs, harbors, and tidal edges. Expect wide horizons, crashing waves, rocky textures, sandy patterns, lighthouses, boats, driftwood, and seaside wildlife. Moods range from peaceful and sunlit to windswept and dramatic, often with salty air, reflections, and shifting skies. Visually, these puzzles favor coastal color palettes (blues, teals, sandy neutrals), repeating wave or ripple patterns, and fine detail in rocks, pebbles, and foam — perfect for lovers of landscapes, gentle challenges, and escape-by-the-sea scenes.