After an update some players' saved progress looks wrong: find out how many

Every change to what you store leaves old saves behind, and some end up with values the game never expected. This entry shows a short list of rules every save must follow, and a count that tells which old version of the save is the one producing broken players.

Why this works

Every change to what you store leaves older saves behind, and the damage shows up only in them. Writing down what must always be true, then counting breaks by rule and by the save's age, points at the one step that went wrong.

When not to use it

It only catches what you thought to write as a rule, so a quiet fault that stays inside allowed values slips through. For a game with few players, simply try a handful of real old saves by hand before each release.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 4 common mistakes and the fix
• 31 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 "After an update some players' saved progress looks wrong: find out how many" (read_entry old-saves-break-after-an-update) 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