The wooden boat has a clear celluloid cover and inside are two ball bearings. The puzzle is to get a ball into the small hole at each end of the puzzle. Unless you know the secret, it’s frustrating. Getting the first ball in is easy – you simply tilt the boat sideways. But when you tilt the puzzle back to coax the second ball into the second hole, the first ball falls out. This is a puzzle that needs ingenuity rather than lots of jiggling. The puzzle has been popular over the decades and has often been used as a commercial give away.