Game Interface UX Prototyping

Designing UX Prototypes for Game Interfaces

Game UI is not a mobile app and not a website. The user holds a gamepad or sees the interface peripherally while following gameplay. So design rules differ: priority goes to readability in motion, quick scanning, and minimal cognitive barrier when opening any screen.

Most UI problems in games don't come from bad visuals but from unexplored screen architecture before the first pixel is drawn.

What Goes Wrong Without Prototyping

Most painful scenario: designer drew inventory, programmer styled it in uGUI, artist added animations—and only in playtesting did it become clear that opening inventory loses the player's location context because inventory fills the screen with no minimap overlay. Redesign at this stage costs 5–10 times more than fixes at wireframe level.

Or another case: branching dialog system that nobody playtested through completely. During implementation it turned out that beyond 3 branching levels the player physically can't fit all answer variants on mobile screen—text gets cut off, buttons overlap.

How Game UI Prototyping is Built

Starting point—user scenarios (user flows), not screens. Typical set for RPG: first launch → tutorial → main gameplay → pause → inventory → shop → settings. For each scenario, we sketch transitions between states: what happens on Escape, what on connection loss, what on insufficient resources to buy.

Then—HUD information architecture. Which data is always needed (health, ammo, minimap), which on demand (inventory, map), which contextual (dialog, quest tracker near objective). This is visibility layer breakdown, and should be fixed before the artist begins.

Figma prototype—not final design. Grayscale wireframe with real text and real data sizes. If inventory can have 500 items—prototype should have 500-item grid, not 6 placeholder icons. This is where it becomes clear if pagination, filters, search are needed.

Interactive Prototype vs Static Mockups

Static Figma doesn't show navigation problems. For game UI, interactive transitions are critical: how menu opens (slide/fade/instant), what happens to background gameplay (pause/blur/nothing), how keyboard/gamepad navigation works.

Figma Prototyping with conditional transitions (Variants + Interactive Components) simulates most of this logic. For complex cases—Unity UIToolkit with UXML prototype without final design: works right in engine, can test with gamepad immediately.

Focus testing on prototype—not luxury. Even 5 people seeing interface for first time find problems team stopped noticing after a month. At this stage it's free. After implementation—expensive.

Platform Specifics in Prototyping

Mobile and PC interfaces are different things even for same gameplay. Touch targets on mobile: minimum 44×44 dp, recommended 56×56 for active elements. This means on smartphone in portrait orientation inventory grid is max 4 columns with 64×64 icons with reasonable padding. If design was made for PC with 8 columns—rework inevitable.

For console UI with gamepad, prototype must include focus management scheme: which element selected by default when opening each screen, where focus moves on D-pad press in each direction. This is documented in prototype text—not assumed.

Prototype Documentation: What Transfers to Team

Prototype without documentation—artifact that loses value immediately after creator goes on vacation. Minimal documentation package for game UX prototype includes three things.

First—Interaction Spec: for each interactive element, all states (default, hover, pressed, disabled, selected for gamepad) and transition triggers are described. Not "button activates on press," but "on OnPointerDown → visual response 80 ms → on OnPointerUp + condition X → transition to screen Y."

Second—Edge Cases Map: what happens with zero data (empty inventory), max data (99 items in slot), network error, action interruption mid-way. This is what programmers find themselves during implementation—but better if answers already exist in documentation.

Third—Responsive Behavior Guide: how each screen adapts to different resolutions and orientations. Screenshots from Figma at 375px, 768px, 1920px width with rules—not just "responsive," but "below 480px width list changes from two columns to one."

This documentation cuts styling time roughly in half and reduces implementation revisions.

Workflow Stages

Start with requirements gathering: game mechanics, platforms, target audience, engine technical limits. Then—document user flows and information architecture. Wireframe prototyping with iterations and internal playtests. After wireframe agreement—transfer to design or parallel visual style development based on prototype.

Cost determined after discussing screen volume and mechanic complexity.