This hack comes in two flavours (patches). One is purely bugfixes, another is minor graphical edits. Pick the one you like best.

List of bugfixes:

From “Super Mario Bros. - Double Trouble”:

• Fixed the glitch where you get a Game Over if you get more than 127 Lives.
• Fixed the Castle wall inconsistencies on some X-3 stages (the end-of-stage Castle)
• Added skid sound during Deadly Wind gusts, as found in SMAS
• Fixed World A-1’s Pipes to match the SMAS version
• Added hammers to Bowser’s routine in Worlds A-D, as found in SMAS
• Fixed various color palettes, including giving Cheep-Cheeps their proper underwater green palette, as found in SMAS
• Fixed the Coin on the status bar to not glitch, like it did in the original SMB2J
• UPDATE 8/15/13 Gave underground green enemies a mountain green palette. Now matches the Allstars version more accurately

From “SMB2 - Restore original Spiny behavior”:

• “This is an IPS patch intended to restore the original Spiny Egg behavior to this game” (they fall with horizontal movement now)

List of graphics changes (optional)

• Beta Mario colors
• Modern mushroom design
• SMB1 platform restored. The one that is mushrooms in SMB2
• Smoother ground tiles

Any suggestions, questions, complaints or assistance needed? Message Marcos Moutta.

Have a nice day

• Database match: Super Mario Brothers 2 (Japan) (En) (DV 2)
• Database: No-Intro: Famicom Disk System (v. 20210111-132854)
• File SHA-1: 0A2397F6C99FB2356A77E03EE032F8EEDF2845C3
• File CRC32: AB7652B7
• ROM SHA-1: 08927227B6FF67F42E759505D176CD924931BD14
• ROM CRC32: 5C419EE8