Merge a joining friend's story progress with the host's world

When a friend joins your world after playing alone, whose story counts? Some things must come from the host, some from the guest, some from whoever got further. Here is how to merge them by clear rules and spot the combinations that make no sense together.

Why this works

When two worlds meet, there is no single right answer for every fact. Deciding in advance, fact by fact, whose version wins, and then checking that the result still hangs together, keeps the shared story from carrying things that never existed.

When not to use it

Skip it when the guest is only a visitor and takes nothing home, so nothing needs merging. Or in a game where each player keeps their own story and meets in a separate shared place; there the worlds never mix.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• A diagram of every state
• 28 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 "Merge a joining friend's story progress with the host's world" (read_entry friend-joins-co-op-story-mid-way) 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