Under The Sea Arithmagons

Our oceans cover over 70% of the Earth's surface. Of all the habitats on Earth the oceans hold the most mystery. While we are aware of hundreds of thousands of marine life forms there are still many more still to be discovered.

See if you can solve these four difficult arithmagons.

The aim of an arithmagon is to work out which numbers go in the empty circles. The numbers in the square boxes are made by adding together the numbers in the circles either side.