SMB3-RS
SMB3-RS: A highly configurable local-browser randomizer focused on SMB3 ROM customization. Ranked #19 of 24 in Game Randomizer Tools by our editors (6.0/10); pricing: Open source; best for browser-based SMB3 randomization.
At a glance
- Editor score6.0 / 10
- PricingOpen source
- Best forBrowser-based SMB3 randomization
- Paid fromFree
- Randomization scopeMulti-scope
- Facts checked20 Sep 2026
Where it wins
- Runs ROM processing locally through WebAssembly
- Covers overworlds, levels, items, enemies, palettes, and progression
- Supports reproducible seeds, flag keys, and shareable URLs
Where it doesn't
- Requires a compatible Super Mario Bros. 3 ROM
- Limited to the web browser
- No verified multiworld or desktop coverage
Our verdict on SMB3-RS
SMB3-RS is an open-source browser tool for randomizing Super Mario Bros. 3 (USA Rev 1) ROMs. It suits players who want configurable runs without installing a desktop application. Users provide their own ROM, select randomization options, and generate either an IPS patch or a fully patched ROM. Rev 0 ROMs can be converted for use with the tool.
Its strongest feature is breadth within SMB3. The published modules cover overworld maps, World Maze progression, levels, airship placements, chest and reward items, power-ups, enemies, and palettes. Numeric seeds make generations reproducible, while flag keys and shareable URLs allow configurations to be passed between players. Processing runs locally through WebAssembly rather than uploading the source ROM, which fits users who prefer browser-based local handling.
SMB3-RS is a focused choice rather than a broad randomizer platform. Its documented scope is the web browser, and the tool requires users to supply a compatible ROM. It also has no verified multiworld or desktop coverage, so users looking for those options should consider an alternative with broader platform or multiplayer support. Pick SMB3-RS for advanced customization across multiple SMB3 systems, especially when local browser processing, patches, reproducible seeds, and shared configurations matter. Choose elsewhere if you need a desktop application, verified multiworld support, or randomization beyond the supported SMB3 ROM workflow.
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SMB3-RS pricing
SMB3-RS fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Randomization scope | Multi-scope |
| Supported platforms | web browser |
| Logic randomization | Yes |
| Seed sharing | Yes |
| Multiworld support | Not verified |
| Customization level | Advanced |
| Deployment | Cloud |
| Platforms | Web |
| Support | Community |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Open source |
| Website | hamstringquestionable.github.io |
| Facts checked | 20 Sep 2026 |
Alternatives to SMB3-RS
- Ocarina of Time RandomizerA deep, logic-based Ocarina of Time randomizer with strong sharing and multiworld support.7.9
- RandovaniaA deep, solver-backed randomizer for players who want advanced control.7.8
- ArchipelagoA flexible open-source framework for completable multiplayer randomizer sessions.7.7
See all SMB3-RS alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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