Game Dev Skill
2D Animation Pipeline
Unity 6 Animator + AnimationClip pipeline for 2D sprite projects convert Aseprite tags to…
$15
Game State Persistence
Unity 6 game save/load system local file (JSON/MemoryPack binary), cloud sync (Apple…
A secure, versioned save/load system for Unity 6 games covering local files, cloud sync, schema migration, and optional anti-cheat encryption. It replaces the deprecated, RCE-prone BinaryFormatter with zero-alloc MemoryPack or readable JSON, adds AES-256-GCM plus HMAC integrity, and recovers from corruption through checksums and backup rotation. Cross-device sync ships for Apple GameCenter, Google Play Games, and Steam with explicit conflict resolution.
$15 one-time
Add to a kit → Prices include 20% VAT. · Forged on real agency work · one-time, no lock-in
- Type Skill
- Category Game Dev
- Delivery Email · instant
- License One-time
Inside the run · no black box
See the actual work before you buy it.
Player progress has three enemies: crashes, cheaters and device switches. Saves get zero-alloc binary serialization, AES encryption with HMAC signatures, atomic writes with automatic backup fallback, and schema migrations that never skip a version.
- Defines the GameSave schema with an explicit schemaVersion field and serializes it with MemoryPack (zero-alloc binary, roughly 3-5x faster than JSON). BinaryFormatter is banned outright: Microsoft deprecated it and it carries a remote code execution risk through untrusted save files.
- Wraps the payload in defense layers: AES-256-GCM encryption for content, then an HMAC-SHA256 signature so a tampered or hand-edited save is rejected before deserialization, with the HMAC compared in constant time.
- Writes atomically: payload goes to a .tmp file, gets flushed to disk, then renames over the live save while the previous file rotates into a backup. A crash mid-write leaves either the full old save or the full new one, never a half-written file.
- On load, verifies HMAC and parses; if the primary save is corrupt it falls back to the backup automatically and tells the player a previous backup was restored. Silently starting a new game is forbidden.
- Migrates schemas strictly in sequence: a v1 save passes through v1-to-v2 then v2-to-v3, each step filling new fields with defaults. Skipping a migration step is banned because it loses data.
- Debounces autosave with a 5-second quiet window and async writes so saving never blocks a frame, and resolves cloud sync conflicts by timestamp; when timestamps tie, the player chooses between devices in a dialog because automatic merging risks losing real progress.
One power source. 6 lines out.
game-state-persistence · core
core active · 6 lines
- ✓ persisting character level
Persisting character level, inventory, and quest progress across sessions
- ✓ syncing save data across
Syncing save data across devices via iCloud, Play Games, or Steam Cloud
- ✓ migrating save schemas s…
Migrating save schemas safely when a game update adds or renames fields
- ✓ encrypting saves to block
Encrypting saves to block resource-hack cheating
- ✓ recovering gracefully from
Recovering gracefully from a corrupted save instead of crashing or starting over
- ✓ throttling autosave to s…
Throttling autosave to stop frame drops from frequent writes
Yours to keep.
Drag time forward. Watch what stays.
Forever
That's what owning means.
The rented stack
ai writing tool: subscription
expired · access lostanalytics suite: subscription
expired · access lostdesign platform: subscription
expired · access lost(nothing left)
Your forge
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Protect players from progress loss: the single biggest driver of game churn
license: perpetual -
Close a real RCE security hole by retiring BinaryFormatter for safe serialization
license: perpetual -
Keep saves fast and small with zero-alloc binary that cuts cloud bandwidth
license: perpetual -
Make cross-device handoff trustworthy with conflict dialogs instead of silent data loss
license: perpetual
subscriptions expire · deeds don't
Everything in the box.
Pick a piece up. Watch it work.
Atomic save pipeline with MemoryPack, AES-256-GCM encryption, and HMAC signing
6 parts · one working system · ships instantly by email
This wasn't forged for everyone.
- Not for you if you'd rather rent a tool than own one.
- Not for you if you want someone else to run your stack.
- Not for you if you're happy guessing.
Unity game developers who need a robust, tamper-resistant, cross-device save system without the security and corruption risks of naive persistence.
then this was forged for you.Works with
Universal by design: these run in any AI. Delivered in the open Agent Skills + MCP format (native in Claude); ChatGPT, Gemini, Cursor and Copilot adapt the same files their own way.
- Claude Native format
- ChatGPT Adapts via open standards
- Gemini Adapts via open standards
- Cursor Adapts via open standards
- Copilot Adapts via open standards
Catch what's on your mind.
the air is clear. nothing between you and the forge.
catch a spark: the forge will answer
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My game ships on Steam and mobile, does cloud sync cover both?
Yes. It includes per-platform guidance for Apple GameCenter, Google Play Games, and Steam Cloud, with explicit conflict resolution based on timestamps and version vectors instead of silent overwrites.
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Couldn't I just roll my own save system with PlayerPrefs or JSON files?
For trivial data, sure. What this adds is the failure handling that bites later: atomic writes, checksum-based corruption recovery with backup rotation, sequential schema migration, and AES-256-GCM with HMAC integrity, while steering you away from the deprecated, RCE-prone BinaryFormatter.
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Does encryption make saves completely cheat-proof?
No. AES-256 plus HMAC blocks casual save-file editing, but a determined attacker on their own device can always dig deeper. Server-authoritative validation sits outside this package's scope.
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How is it delivered?
By email right after purchase: ready to run, downloaded instantly, no setup wait.
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One-time or subscription?
A one-time purchase; no subscription or hidden fees. VAT (20%) is included.
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Can I get a refund?
As a digital product, it can’t be refunded once downloaded. That’s why we show exactly what’s inside and who it’s for, right here.