Tip: When you're about to release your hack, make a patch first, patch it to a clean ROM, and then test that. This way, you are testing both the hack AND the patch.
This code will enable Bowser's Valley thunder effect - including sound effects - in your level. Unlike the plain SMW's routine, this one doesn't mess up with palettes.
Great but there is a bug when you pause the game after or before the thunder, the palette effect and sound effect will endlessly play, unless the player unpause the game
Previously a generator, converted to UberASMTool code to avoid waste of sprite slots. But for convenience, a PIXI-converted generator version is also included for those who want to activate the effect in very specific circumstances. Added screenshot, tags and SA-1 support.
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