This 4×4 might run you off the road.
Todays challenge is a superb new type of puzzle called Sweet 16.
Place the numbers from 1 to 16 in the grid below so that they obey the horizontal and vertical equations.
The circles are odd numbers and the squares are even. Were given the 1 as a start. Now use basic arithmetic to fill in the rest. Its helpful to have a physical copy of the puzzle, so click here for a printable version.