Confirm the normal game works
Walk around, enter a battle and create a save without mods. This gives you a known working point.
Optional extras
Add Gen2Recomp mods only after Pokemon Gold, Silver or Crystal is working normally. Check that each mod supports your game, keep a backup, and test one change at a time.
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Mods are optional additions made for Gen2Recomp. Depending on the mod, they may change the appearance, menus, quality-of-life features or parts of the game experience. The built-in mod manager lets you add, enable, disable and remove these extras without replacing the normal game.
Walk around, enter a battle and create a save without mods. This gives you a known working point.
Copy important progress and settings before changing the active mod list, especially during beta updates.
Look for a clear Gold, Silver, Crystal or Gen2Recomp statement. Do not rely only on a familiar mod name or screenshot.
Launch the game after each new mod. If a problem appears, you will know which recent change to disable first.
Use mods that name Gen2Recomp and Gold, Silver or Crystal support. Gen1-only mods can target different maps, events or game rules and should stay disabled unless their author confirms Gen2 compatibility.
If the normal game works with all mods disabled, the problem is likely related to a mod or a combination of mods rather than the main setup.