Replay a player's recorded inputs and find the exact step where your game goes wrong

A player says that after a long fight the game ended up in a state that cannot be right, and nobody can reproduce it by hand. This entry shows how to record a run so it can be replayed exactly, and how to name the first moment where two versions of the game disagree.

Why this works

A bug is easy to chase only when the same input always gives the same result. If the game is a plain rule from old situation plus one action to new situation, a recording replays exactly, and comparing two runs turns a vague hunch into one precise moment.

When not to use it

It does not help when the trouble comes from outside the rules, such as a slow network, a device quirk or a screen that draws wrongly. There, watch the live game on the affected device or collect its own error messages instead of replaying.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 31 lines of example code with 4 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Replay a player's recorded inputs and find the exact step where your game goes wrong" (read_entry replay-log-first-divergence) 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