The wild has the highest regular payout on the paytable for 5 of a kind. Wilds will also pay out a multiple of your line bet if they combine to form a win with the box symbols. The multiplier on the wild will depend on the colour of the boxes it forms a win with. For example, if a wild forms a win with blue boxes, it will pay 10x the line bet, which will be added to whatever multipliers are revealed by the boxes.