Spot the Differences is a series of four books containing spot the differences puzzles sometimes also known as ‘photo hunt games’. The sole purpose of these puzzles is to find the differences between two seemingly identical pictures. These games are all about being sharp and quick as they are sure to exercise your brain to spot the differences which may be in the colour, size, shape, position, appearance and number of objects. There may also be some missing objects and differences in facial expressions. Each set of pictures has eight differences. It really seems to be simple to spot the differences but looks can be puzzling.