This is a simple patch for Super Mario Bros. 3 that removes/reduces the full screen flashing effect found in various places throughout the game, for players with photosensitive epilepsy or those sensitive to flashing effects. Specifically the following instances:

• Exploding bob-ombs
• When Boom Boom is defeated
• Collecting an orb/wand
• Using a whistle
• When Fortresses are destroyed
• Bowser’s letter at the end of World 7

There are two versions of the patch.

(Reduced) - With the first three scenarios above, the background will simply turn a static orange when the flashing would normally occur. When a whistle is used, the white flash will only occur once and not be as rapid. The remaining two effects are completely removed.

(Removed) - All flashing effects are completely removed.

Compatible with both SMB3 PRG0 and PRG1/Rev A.

Version 1.1 - Removed flashing from Bowser’s letter at the end of World 7.

Version 1.2 - Removed flashing on the map when a Fortress is destroyed. Added an alternative patch (Removed) that completely removes all instances of flashing.

• Database match: Super Mario Bros. 3 (USA) (Rev 1)
• Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
• File SHA-1: 6BD518E85EB46A4252AF07910F61036E84B020D1
• File CRC32: B742B33
• ROM SHA-1: BB894D104C796F69BA16587EB66C0275F5C2FC02
• ROM CRC32: 2E6301ED