Open a shared world save from an older version without losing anyone

After an update, the world your friends built last week must still open. Saves written by older versions have a different shape, and a broken or hand-edited file can hold impossible values. Here is a loader that upgrades old files step by step, repairs what it safely can and refuses what it must not guess.

Why this works

A saved world is a promise to the people who built it. Upgrading one version at a time keeps each step small, and writing down every repair means nothing is changed in silence, so a problem can be traced to where it began.

When not to use it

Skip the repairs when a damaged file may hold something you cannot guess, such as a world that costs real money: refuse it and keep the original untouched instead. Also skip all this for a game whose saves never need to outlive an update.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 42 lines of example code with 3 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Open a shared world save from an older version without losing anyone" (read_entry online-load-old-shared-world-saves) in my game. Build it step by step, and show me how you checked that it works.

Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP