Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
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Details for Super Mario All-Stars: Super Mario Bros. 3 - Green Mountains (With Snow)
SMW Graphics - Super Mario All-Stars: Super Mario Bros. 3 - Green Mountains (With Snow)
This is a better version of XM's background on the site. His was bleh since it lacked a sample level, (That was a big annoyance especially since I had to map it out myself) the correct palette and it replaced palette 0 which messed up the status bar, (the colors were rather darker than the original) it had a bunch of garbage in the Map16 file, and it was actually missing some vital tiles necessary. (not gonna go into detail on which ones were missing)
Sample Level replaces level 107 so plan around if that's used.