World 6 (Super Mario Run)

World 6 is the sixth world in Super Mario Run. Although its exact terrain is unknown, it contains four levels that consist of the fortress, grassland, underground, and airship themes, respectively. This world is available after completion of World 5, and unlocks World Star upon its own completion. 
==Levels==
===Land of Spikes===
A desert level with many Spikes.
=== Switch Ghost House===
A mansion level that heavily utilizes P Switches and ! Switches.
===Throwing It All Overboard===
An airship level with many Ninjis and Rocky Wrenches.
===Bowser's Bob-ombing Run===
A castle level with the final boss fight against Bowser.
==Enemies introduced==
*Spikes
*Rocky Wrenches
*Bob-ombs
*Bowser (boss)