All Super Mario Land 2 Secret Exits + Secret Exit Level Locations Guide

This is a guide on where to find secret exits in levels in Super Mario Land 2. It shows how to get all the secret exits, and how to beat the secret levels.
There are 6 secret levels. They are spread across 5 zones. The MARIO ZONE is the only zone without a secret level.
Mario Land 2 - Secret Level Locations Walkthrough
TREE ZONE - Level 2 Secret Exit - Secret Level 1
SPACE ZONE - Level 1 Secret Exit - Secret Level 2
MACRO ZONE - Level 2 Secret Exit - Secret Level 3
GHOST ZONE - Level 2 Secret Exit - Secret Level 4
GHOST ZONE - Level 3 Secret Exit - Secret Level 5
TURTLE ZONE - Level 2 Secret Exit - Secret Level 6