Let's identify and examine the compositional techniques used in Mario Kart 8 Wii U - Haunted Mansion to enhance the gameplay and visuals! Please refer to the following video:
The eerie melody captures the atmosphere of the haunted mansion. For example, the melody has the diminished 5th interval and creates an unnerving tritone interval. This tritone interval was also used in Mario Kart: Double Dash - Luigi's Mansion/Bowser's Castle in the key of e-flat minor as well as in the Luigi's Mansion Main Theme in a minor:
Similarly, the g minor melody in Haunted Mansion hovers around the 5th scale degree. The rhythm is less active to allow for the long line of the melody to be heard.