![SMB3 for Super Mario All-Stars Custom Level #566 - World 6 Fortress [SMB3 Mix] @insectduel](https://i.ytimg.com/vi/eJCYYMI6LzM/maxresdefault.jpg)
Uploaded August 2025 | Updated September 2026, 10 hours ago
Level by Southbird
A conversion of SMB3 Mix from the NES version by Southbird. SMB2USA boss music is omitted and you fight Boom-Boom in the end.
My Facebook page
facebook.com/insectduel
For SMB3 ROM-Hackers, please join my Facebook group page
facebook.com/groups/121487385079292
Level by Southbird
A conversion of SMB3 Mix from the NES version by Southbird. SMB2USA boss music is omitted and you fight Boom-Boom in the end.
My Facebook page
facebook.com/insectduel
For SMB3 ROM-Hackers, please join my Facebook group page
facebook.com/groups/121487385079292
![SMB3 for Super Mario All-Stars Custom Level #566 - World 6 Fortress [SMB3 Mix]](https://i.ytimg.com/vi/eJCYYMI6LzM/mqdefault.jpg "SMB3 for Super Mario All-Stars Custom Level #566 - World 6 Fortress [SMB3 Mix]
Level by Southbird
A conversion of SMB3 Mix from the NES version by Southbird. SMB2USA boss music is omitted and you fight Boom-Boom in the end.
My Facebook page
http://facebook.com/insectduel
For SMB3 ROM-Hackers, please join my Facebook group page
https://www.facebook.com/groups/121487385079292/")
