# We discovered a new variant of Super Mario Bros.

> **Open Intelligence Dossier** · First detected: 2026-07-29 22:07 UTC · Category: Technology

## Executive Summary
Collectors have discovered 97 copies of a never-before-seen Super Mario Bros./Duck Hunt variant found in a Wisconsin retro store.

## Intelligence Brief
A significant discovery in gaming history has emerged following the find of 97 copies of a previously unseen variant of Super Mario Bros. combined with Duck Hunt. According to reports from IGN and Nintendo Wire, these NES cartridges were discovered by a collector in a retro store located in Wisconsin. The haul is described as a historic find, with eGamers.io noting that these specific Mario and Duck Hunt cartridges had sat forgotten for a period of six years. The scale of the discovery has left those involved shocked, as the version of the game is described by IGN as an unreleased version of the title. Coverage of this event is widespread across enthusiast outlets.


Time Extension highlights the emotional impact of the find, quoting a reaction that the blood drained from the discoverer's face upon realizing the rarity of the items. GoNintendo and eGamers.io emphasize that this constitutes a substantial piece of Nintendo history found in a single box. The reports collectively focus on the rarity of the variant and the unexpected nature of finding nearly one hundred copies of an unreleased game in a retail setting, marking it as an incredibly rare find for the retro gaming community. Parallel to this discovery, recent coverage has focused on the technical origins of the original game's mechanics. According to reports from MyNintendoNews and Nintendo Everything, Shigeru Miyamoto has discussed the origins of the famous dash mechanic.


Miyamoto revealed to GamesReviews.com and GoNintendo that the iconic B-Dash, as well as hidden blocks and gap running, actually began as coding bugs or glitches. Rather than removing these errors, Miyamoto chose not to fix them, which eventually led to the integration of these elements as core gameplay features in Super Mario Bros. Future developments will likely center on the analysis of the 97 discovered cartridges to determine how they differ from the standard release. While coverage does not yet specify the exact technical differences of this Wisconsin variant, the discovery of an unreleased version suggests further investigation into Nintendo's production history. Additionally, the industry continues to reflect on the ability of glitches to shape game design, as evidenced by Miyamoto's recent commentary on the B-Dash mechanic and its accidental origins in the software's initial coding.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| mynintendonews.com | Miyamoto talks the origins of Mario’s famous dash mechanic | [Source Link](https://news.google.com/rss/articles/CBMinAFBVV95cUxOUU92VTFUdDhrenVna183UXlodnZMQ2FsemNJSzVRWnNNQ045T3ctMDZvSldXc3haTnYtUmVpN1RuY1llZlRwSjA2UnNXS0lHSm1EbVdwR3hvZlpvU05fNTd0QWFHdFZsWGg0WndGNXFnNnh5Rl9PcmV6M3pOQmVDaU1mdlhYVy1zVVJZRU9uMGZlOUxkam5jWEo0Ym8?oc=5) |
| GamesReviews.com | Miyamoto: Super Mario Bros.’ Iconic B-Dash Started as a Coding Bug He Refused to Fix | [Source Link](https://news.google.com/rss/articles/CBMitgFBVV95cUxNTmZxZk52VVR2LVNzSEhxR0VaTkdNX2RpLTFBU1g5OWNqdlNFNzc1VWVpMDFtNnpLeEs0dHhNcUpGZUU0cVA5ZEFvOXVUT240NWxNZFJ3RjhKNW1NQm9BWGlzak1xc1ZYNUdXMVRVQXFnUzhweER5N2JuWnI5RnNGTXN3NFB5VlpKbHotVlZmclBPc1R3UHBRSjlGbTlXUHNCMWp1cGhUbElvZUhYQkExb1B1YXRqZw?oc=5) |
| GoNintendo | Miyamoto says Super Mario Bros' B-Dash gap running and hidden blocks were the result of glitches | [Source Link](https://news.google.com/rss/articles/CBMiwwFBVV95cUxQSDVPNEdFT2JjZU9rUEtVY2tmcmJHM2ItenlaWDdDMW1zY3NzbDVaM3VmeU5MUnVXXy1ZZk1oNzVNVDN3Zy04S0hvZHBXTEVjc3ZwRTZJZ3VOaW92LWhwTWEzRkpia1VNTU1yUTYzajAzVVB2c1dlMkI1UWMyQ1JPNDNPVkZjTnJSRVJSX3MwQnlibzlUNjZ0YzNJcUNGd3JKekJ2NDh6Vk9HRG1pTHE1eHVKY2diOTFXZTJzdDgwRHo4U00?oc=5) |
| Nintendo Everything | Miyamoto reveals the origins of the famous dash mechanic in Super Mario Bros. | [Source Link](https://news.google.com/rss/articles/CBMirAFBVV95cUxQX0RNMTN6aW1YQnVHcWctUUhTQmFTSWFiZnFXWjFPdlVYSlczRkhjMHE1cmRUQVhuTzdrRVBPb183ZFd1Uzl5VllWWDlpRnRzM2VOcDVSd0h1UU9vZVFMVEIyNVhmN3JBMDlCc2Y2bFk0UWRnYWRhZEozS29jTkNDZWxMZ1dpRUh6Y2dxWHFHUjkzc2JfTHZDZHNrb2tUbUREYWlvVjF5bngzSnU2?oc=5) |
| Time Extension | "The Blood Drained From My Face" - 97 Copies Of Never-Before-Seen Super Mario Bros. Variant Found In Wisconsin Retro Store | [Source Link](https://news.google.com/rss/articles/CBMi8gFBVV95cUxQLTl3Q3dMWXNnb3hhVGpoc19SaElPM2pNT21ZX2c1Z20tQTdZdUVVUDJFa3ZDQlpEa2prQXFpV2xvLVVaYTZCMlhGVjhCWDMxdHhZYl9Iek9PXzV6Z3gzSW9iaVJUWlBKVkhLZE1qN29XMDhFdmVWbXByZnppS3ZVNG81ZXRncndUemdaUENNWHhaZ3FlcDdwV21pQ3M2eGRuSVhVRDJmSjFXLTRZNTdocFJaYlNCX3RHcTRLbVJ4OVRIZ2xneWNydmlYN2lJMGZzUkw0ellrQ1p3ZTJBNzdObUx5RU5kcTRjZVJmUzV5OXQwUQ?oc=5) |
| eGamers.io | Nintendo history in a box: 97 unseen Mario/Duck Hunt carts sat forgotten for six years | [Source Link](https://news.google.com/rss/articles/CBMiqAFBVV95cUxOTmtsbHlickZTM2M1VjlFczdsbnFOVExQSWZ2b3d6blAyVmZDVERHeW9TWktydi1rdjM5NlZOek85cExfT1p6UjJreU1aREFwWUFaNTNkZ3k3TVBXNkZlQXl3NXlWMnN4TnV3YXQybWlIaDkzN3cwc1VZakc5WkFlazJlTWs2SlZaN1hVdXVGT0pSd3VSOUhlOWtfMlAyYlJOSlh2WWxxbTQ?oc=5) |
| GoNintendo | Collector discoveries incredibly rare Super Mario Bros./Duck Hunt NES copies | [Source Link](https://news.google.com/rss/articles/CBMiswFBVV95cUxNOVJkUkxWbTRUTnpwYXNPVll0am5jdmhSZTc0YXVPd2hBWGwtQ0tKcXNQbGczRGd4VU9MV1RSbGFMclRSUExDcDRENU44S3ZTRDRIb0FteEZRWllzdTZrTzdXRnlkVUp6LVNTeW5Jc3dyUE5FWWN1SmRaNHpOMGdfQm9pTmtBUy1HaGhqVW5vbmJNblVBSlpRTVJzU1BpcFViNWNCcGxTUkVCSkpMUkdjRG1uOA?oc=5) |
| IGN | 'We Were Shocked' — Collector Discovers Unreleased Version of Super Mario Bros. Duck Hunt in Historic Haul | [Source Link](https://news.google.com/rss/articles/CBMi1AFBVV95cUxNMWpWNnktUTFQdEk1RHNyYTZsOVdoYzQ2NjJnY3NuZjdyeXROcGZTZmFzeDJfb3Q3SnNQSFFGWTN1MG1xMjJVZHBSOW1PdXo4ckI1RmNaRXpUWjhQbFVxeXF6Y2lzdGJqazVUNTliLWhoRE5DR3JrTGY2WjVVRHpuQ01kY0pBZ2NLWDdLWXg2WGxfY2RtcmNQMXdOakRob3dnNE5UcllYeUdfbjdVeWRyY0lEM3NudllOMjF2dmUzN3NleDBrbTcwX19mSzNJaHFXd2U2Mw?oc=5) |
| Nintendo Wire | We discovered a new variant of Super Mario Bros. | [Source Link](https://news.google.com/rss/articles/CBMijwFBVV95cUxPWjllTmd0d0hDSjFlcFozM0JQR3F2d29BRTJXVmp6ZEhjalQ4eTNwcWtDQW83bG5lODBtNm9BYkZtbVRaOUlUV3dMZklPXy1aU0diTnJ3TTFYSkNsNDRYaC1VbjNjdDJXT0g2ZWlWeXZIaTZDME9QTFhKR1c4X1NNX1ZjRHN3RC0ybVRrQ1Zydw?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-07-29/we-discovered-a-new-variant-of-super-mario-bros*