Puzzle 12: Nautical Crossings

Visual clue. Four underwater scenes showing aquatic life.

The hook. Different species of fish depicted in their natural aquatic habitats.

Visual clue. Large structural crossings spanning over water.

The hook. Impressive engineering feats allowing transport across major rivers and harbors.

Here's the trap we set. Every stamp in this group features boats or ships beneath the crossings, tempting you to group them with the other watercraft!

Visual clue. Tall coastal towers designed to emit light.

The hook. Crucial navigational aids built to guide maritime vessels safely along rocky coasts.

Here's the trap we set. Three of these lighthouses are depicted alongside ships or boats. If you tried to make a 'Boats' group early on, these likely got in the way.

Visual clue. Vessels powered entirely by wind in their sails.

The hook. From traditional island crafts to modern Olympic racers, these boats rely on the breeze to navigate open waters.

Here's the trap we set. This is the true 'Boats' group! With 11 different stamps in this puzzle featuring some kind of ship, identifying the pure sailboats was the final challenge.