The fourth out of 5 compilations of my all time favorite custom SMB3 levels from 2010 to 2021. Levels in this 4th lineup are:
1. Plain Simple
2. Koopahari Desert
3. Tank It Up
4. Bony Desert
5. Seashore Slam
6. Thwomp Town
7. Custom Water
8. Subtle Slopes
9. Bro Battle Bash
10. Flooded Fortress
11. SMA4 Mad Dash
12. SMA4 Underground Action
13. Focal Fortress
14. Focused Fleet
15. Fortricus Giganticus
16. Freezing Fields
17. Sunny Slopes
18. Sample Ship - Alternate
19. Simple Fields
20. Coppitt Clouds