Tip: You can use Lunar Magic's Overworld Layer 3 Editing system to edit or create your own layer 3 images (castle bricks, fish, rocks) and apply unique effects per level via the Layer 3 Bypass in the main editor.
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Details for Mario & Luigi: Superstar Saga - Oho Ocean
SMW Music - Mario & Luigi: Superstar Saga - Oho Ocean
AMK bug: there was an open [[ in #7 which never got closed. It didn't throw any error, but I fixed it for you anyways.
Speaking of #7, looping could've been way better, but you'd have saved around 30 bytes at max so..
Song itself is nothing too great. The last part gets better atleast.