The check will be Average difficulty, so without any modifiers, you'd have to roll a 10-sided die (d10) and get an 8 or higher to pass.  Fortunately, our Wisdom attribute and Spot skill will modify the roll.  Both my Wisdom and Spot are over 81, which means they each add a -3 modifier to the difficulty check.<br/><br/>-3 + -3 = -6.  And 8 - 6 = 2.  In addition, Ricky is in Top Shape, which adds a -1 on to the DC.  2 - 1 = 1.  So, for Ricky, he needs to roll a 1 or higher to pass the DC.