Solomon's Keychain review
A focused Windows editor for modifying Solomon’s Key levels and exporting ROM patches.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Solomon’s Keychain is a free, open-source Windows desktop editor for modifying Solomon’s Key on NES. It is aimed at fans creating or revising levels for that game, including solo editors and people working on level-pack projects. Its scope is deliberately narrow: it is a dedicated toolkit for Solomon’s Key rather than a general-purpose ROM editor, so it makes sense when that game is the target and not when a project spans multiple titles.
Editing covers level block layouts, enemies, items, and metadata across US, EU, and Japanese ROM versions. The tool also handles Demon Mirror enemy drop sets and schedules, giving editors control over details beyond the visible arrangement of a level. ROM expansion allows edits that exceed the game’s existing data-size limits. Changes can be saved as a patched NES ROM or exported as an IPS patch, while XML files support metadata and individual levels. Configurable external XML supplies graphics and element descriptions, which offers flexibility for customization but means those resources are part of the editor workflow.
The vendor provides precompiled Windows x64 releases as well as source code for building the application. This is a practical fit for Windows users who want a specialized editor and patch-export workflow for Solomon’s Key, especially those managing level data in XML. Its game-specific focus is also its central limitation: people seeking tooling for other NES games or a broader ROM-hacking environment should choose another editor. No subscription decision is involved, but users should be comfortable with a Windows desktop tool and its XML-based customization options.
Solomon's Keychain pros and cons
- Where it wins
- Edits level layouts, enemies, items, and metadata
- Supports US, EU, and Japanese ROM versions
- Exports patched NES ROMs or IPS patches and supports ROM expansion
- Where it doesn't
- Limited to the game Solomon’s Key
- Runs on Windows x64 only
- Graphics and element descriptions rely on configurable external XML
Solomon's Keychain fact sheet, pricing and score →
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