01 / Foundations
What is a pass-through mod?
A pass-through mod treats one game as the stable frame and lets a focused mechanic from another game pass through it. This makes the idea small enough to prototype, review, and undo.
The problem to solve
The common mistake is describing a complete crossover instead of a single player decision. That leaves camera, physics, saves, and level scale undefined until the implementation is already tangled.
Write the expected behavior before changing a game directory or adding a new dependency. A precise failure statement helps you choose a smaller test and prevents a tool from becoming a collection of unrelated experiments.
A practical method
Choose the base camera and input first. Then express the imported mechanic as a local state change: a heat meter, a shield, a building zone, or a timed traversal rule.
Keep the base loop, input contract, and save boundary visible. Use original placeholders and a reversible local test whenever the workflow touches game files or generated assets.
How to verify the result
Run the same room with the imported mechanic disabled and enabled. The comparison should reveal a different decision, not merely a different skin.
Record the engine or tool version, the exact steps, the observed result, and the recovery path. A problem article is useful when another reader can reproduce the check without guessing what changed.
101 / Quick answers
Common What is a pass-through mod? questions
001Is a pass-through mod a full port?+
No. It is a bounded system experiment inside an existing playable frame.
002What should the first test include?+
One controlled scenario, one expected result, and one reset or restore path. Expand only after that scenario is repeatable.
003What should I document?+
Document the base game or tool version, required ownership, files changed, expected output, and the safe way to undo the experiment.
004What should I avoid?+
Avoid distributing proprietary files, bypassing ownership or anti-cheat checks, and making irreversible changes before a backup and a small test exist.
FAQ
FAQ
Is a pass-through mod a full port?+
No. It is a bounded system experiment inside an existing playable frame.
Can I solve this with a larger prompt?+
Usually not. A smaller prompt tied to one reproducible failure produces a more useful implementation and a clearer review.
Where can I continue?+
Continue with game merging or choosing a base game or scope a vertical slice and compare the linked workflow before expanding scope.
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