Play Mode Saver – Don’t Lose Your Runtime Tweaks

Stop Losing Play Mode Changes in Unity -

Unity Play Mode is great for testing, but once you press Stop, all runtime tweaks are gone.

Values you carefully tuned, transforms you adjusted, debug changes you verified — everything resets.

Play Mode Saver fixes this workflow problem.

It tracks changes made during Play Mode, shows you exactly what changed, and lets you safely decide what should persist.

🚀 NEW in v1.1: THE PRO UPDATE We've listened! v1.1 transforms Play Mode Saver into a pro-grade tool.

• DEEP SERIALIZATION: Resize arrays, modify lists, and change deep structs at runtime. It just works.
• ZERO-CLICK WORKFLOW: Use [AutoSavePlayMode] on your scripts. Tweak stats in play mode, and they'll save automatically on exit. No prompt needed!
• PREFAB MASTER: Apply changes directly to your source prefabs with one click.
• PERFORMANCE FIRST: Re-engineered system ensures zero lag even in complex scenes.

🔧 What It Does -->

Live Runtime Change Tracking

• Detects modifications made during Play Mode
• Highlights changed GameObjects in the Hierarchy
• Marks modified fields directly in the Inspector

Smart Restore Window

• Automatically appears when exiting Play Mode
• Clear before/after comparison of values
• Apply changes selectively or all at once
• Works cleanly with Prefabs and overrides

Runtime Change Review & Export

• Review all modified values in a structured diff view
• Export selected changes for long-term use
• Helps convert temporary runtime experiments into permanent decisions

Attribute-Based Control

Fine-grained control over what should or shouldn’t be saved:

[SaveOnPlayModeExit]

[IgnoreRuntimeChanges]

Undo-Safe

• All applied changes are registered with Unity’s Undo system
• Fully reversible Preset, editor-friendly workflow
• Fully JSON Export Supported!

Designed for Iteration

• Experiment freely during Play Mode
• Decide later what should become permanent
• Reduce trial-and-error and repeated manual tweaking

Stable & Editor-Safe Workflow

• Editor-based solution with predictable behavior
• Works alongside Unity’s serialization and Undo system
• Designed to fit cleanly into existing production pipelines

✅ Compatible With

• Scenes, Components & Prefabs
• Built-in and custom components
• Unity 2021.3 LTS and newer (including Unity 6)

🎯 Ideal For

• Developers iterating on gameplay tweaks
• Designers tuning values live
• Teams tired of redoing Play Mode work

Play Mode Saver turns Play Mode into a safe experimentation space instead of a disposable test.

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