AI assisted with source research and drafting. The disguise prototype below is a design proposal, not a completed playtest or a claim of personal experience with Prey.
A disguise can change how a character looks, how an observer reacts, and which actions become possible. Those changes need to agree. If the player becomes a small object but still moves through the world exactly like a person, the new appearance may promise more than the game supports.
Prey's Mimic Matter offers a concrete SF example of connecting a borrowed appearance to play.
Give the borrowed form a practical use
In Bethesda's February 2017 Mimic Madness feature, lead designer Ricardo Bare describes using Mimic Matter to hide from an alien, prepare an ambush, or become small enough to enter a security booth through its slot. The same article describes copying everyday objects such as a mug or lamp.
The March 2017 powers guide adds an important qualification: the player can move while disguised, but movement may attract attention. It also documents a continuing psi cost.
These are historical descriptions of the game's mechanics. They support a design question rather than a claim about what caused its success: what does the disguise allow, and what must the player do to keep benefiting from it?
The small-object example changes a spatial possibility. The warning about movement changes behavior around observers. Together, they make the copied form more than a costume selection.
Write down the disguise's promises
For a new prototype, separate three decisions:
- Appearance: What does the player become?
- Permission: What can that form do that the ordinary character cannot?
- Exposure: Which behavior gives the disguise away?
This is a proposed design checklist, not a description of Prey's internal implementation.
A convincing visual transformation sets expectations before a tutorial says anything. A small rolling object suggests different movement from a tall, walking character. A stationary container suggests different behavior from a maintenance robot. The game does not need to simulate every property of either object, but it should make its chosen rules understandable.
Keep the initial promise narrow. One form with one useful permission is enough to test whether players understand why they would choose it.
Test one form in one room
Imagine a fictional space-station storeroom. A normal-sized character can reach the exit by taking a long corridor. A small disguised form can instead pass through a low opening. Both routes work.
Add a patrolling observer near the opening. In this invented prototype, the observer ignores the disguised player while they remain still, but notices movement within its visible viewing area. Give the player clear feedback when noticed, plus a nearby place to retreat and try again.
These are prototype rules, not a reconstruction of Prey's enemy detection.
First test the room without a timer or resource drain. That lets you examine whether players understand the form and its exposure rule before combining them with another constraint. Explain the controls, then let them choose a route without prescribing the solution.
Watch for three different failures:
- They never consider the opening because they do not connect the small form with fitting through it.
- They understand the route but cannot tell when the observer can see them.
- They understand both rules but find stopping and moving tedious.
Those failures need different revisions. Making the opening clearer will not fix a dull waiting pattern. Shortening the patrol will not explain an unclear disguise.
Afterward, ask what becoming the object let them do, what could expose them, and why they chose their route. Fast completion alone does not show that the disguise was satisfying.
Keep the alternative worth choosing
The longer corridor matters because it lets a player decline the disguise. If everyone takes the small opening, that could mean the disguise is enjoyable, or simply that the other route is unreasonably slow.
Vary the corridor length before adding more forms. Look for a situation where players can explain a preference rather than identify one mandatory answer. Some may enjoy timing their movements around an observer. Others may prefer the predictable walk.
A later test could add a limited duration or resource cost, but that would answer a new question. First establish that the basic disguise is readable and worth using.
Prey's documented ability suggests a useful starting point: give the borrowed form a concrete consequence, then let the player act under its rules. Before expanding a catalogue of disguises, find out whether one transformation changes a decision in a way players understand and enjoy.
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