World 3 (Super Mario Run)

World 3 is the third world in Super Mario Run. It is the only free world, and completing it unlocks World 4.
==Levels==
=== Big Spiny Blitz ===
A desert level with many Big Spinies and a Lakitu.
=== Bullet Bill Barrage ===
A sky level with Bullet Bills and Missile Bills.
=== Shell Me the Way! ===
A grassland level with many Koopa Troopas, Goombas and Brick Blocks.
=== Fire Bar Castle! Youch! ===
A castle level containing Fire Bars and Podoboos, as well as the game's third boss battle, against a Fake Bowser.
==Enemies introduced==
*Big Spinies
*Lakitu
*Missile Bills
*Munchers
*Fire Bars