Reused from games/mario-mix/classic-mix.js, existing 1-1 sprite data and decoder.
Source: umaim/Mario, Source/settings/sprites.js, blob 9566387f26f584b197859aa8e2f0b7e481d1cb79.
Code license does not transfer character/artwork rights. Existing website RIGHTS.md applies; no new asset rights are granted.

MIT License

Copyright (c) 2018 Cloud

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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2026-09-19: source-sprite-data.mjs additionally retains the complete sprite library, palette and filter data from the same fixed upstream commit. Provenance and source hashes: ../reference/SPRITE_SOURCE.json. source-art.mjs decodes data only; no upstream game scripts are executed.

2026-09-19: Castle, Underwater, hurry variants, World Clear and Bowser recordings use the same fixed upstream source. Hashes: ../reference/AUDIO_ADDITIONS.json. Original game audio remains third-party material, not relicensed by this project.

2026-09-20 local Bill integration: reuses existing games/mario-mix/assets/bill.png, projectiles/contra-*.png and character-audio recordings (Contra jungle, Bill death/pickup and N/M/S/F/L shots). Character/art/audio rights remain with their respective owners; the Mario source code license above does not cover these Contra assets. No new third-party assets were downloaded.
