What is the Most Common Level Theme in the Mario Series?

Like it or not, the Super Mario series is pretty set in its ways in regards to level themes. No matter whether we're playing in 2D and 3D, we always come across the same variations of world themes: grasslands, deserts, beaches, underwater, snowlands... every Mario fan can name plenty of examples of each. But even among what have certainly become tropes, not all themes are equal. Which left me to wonder... what is the most common level theme in the Super Mario series? And today, hours of research later, I present to you the final results! CHAPTERS: 00:00 - Introductions and Explanations 02:46 - The Least Common Level Trope 04:17 - Number 12 05:53 - Number 11 07:28 - Number 10 09:13 - Number 9 10:44 - Number 8 12:12 - Number 7 13:36 - Number 6 14:44 - Number 5 16:12 - Number 4 17:49 - Number 3 19:40 - Number 2 22:00 - Number 1 23:52 - Honorable Mentions Footage may be courtesy of: World of Longplays Longplay Archive FCPlaythroughs #mario #supermariobros #supermario