rbergman/accessibility-design

Accessibility Design

Purpose: Make games playable by the widest possible audience through deliberate, integrated design. Accessibility isn't a feature you bolt on — it's a lens you design through. Games designed for the margins are better for everyone.

Standards: This skill draws on WCAG (Web Content Accessibility Guidelines), the Xbox Accessibility Guidelines (XAG), and the Game Accessibility Guidelines (gameaccessibilityguidelines.com). These represent industry consensus, not aspirational ideals — major platforms now require or incentivize compliance.

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When to Activate

Use this skill proactively — not after someone reports a problem:

• Designing any player-facing feature (UI, controls, feedback, narrative delivery)
• Evaluating an existing game or prototype for accessibility gaps
• Responding to player feedback about barriers ("I can't read the text", "I can't tell these apart")
• Designing difficulty options, assist systems, or adaptive mechanics
• Implementing subtitles, captions, or audio description systems
• Designing or reviewing input systems (remapping, sensitivity, alternate schemes)
• Planning a colorblind mode or high-contrast mode
• Reviewing a feature that uses color, sound, or timing to convey critical information
• When the answer to "can a player with [disability] complete this?" is uncertain

When a player says "I can't play this" — that's a design failure, not a player limitation.

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Core Principle: Accessibility Is Design

Accessibility features aren't accommodations for edge cases. They're design improvements that happen to be essential for some players and beneficial for all.

| "Accessibility" Feature | Who It Was "For" | Who Actually Uses It | |------------------------|-------------------|----------------------| | Subtitles | Deaf/hard-of-hearing players | Everyone on public transit, in noisy rooms, or with sleeping partners | | Remappable controls | Players with motor disabilities | Everyone with a preference or non-standard controller | | High contrast mode | Low-vision players | Everyone on a mobile screen in sunlight | | Adjustable text size | Vision-impaired players | Everyone sitting far from a TV | | Difficulty options | Cognitive accessibility | Everyone whose skill level doesn't match one preset | | Motion reduction | Vestibular disorders | Everyone who gets motion sick from excessive camera shake |

This is the curb-cut effect: design for the margins and the center benefits automatically.

Design rule: If a feature helps 5% of players and harms 0%, ship it.

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The Four Pillars

Accessibility barriers organize into four categories based on the player need they address. Most games have gaps in all four — prioritize by the tiers in the next section.

Pillar 1: Visual

Players who are blind, have low vision, are colorblind, or are photosensitive.

| Barrier | Solution | Standard | |---------|----------|----------| | Color-only information | Add shape, pattern, text, or position as redundant channel | WCAG 1.4.1, XAG 106 | | Small text | Scalable text, minimum 28px at 1080p for body text | XAG 102 | | Low contrast | 4.5:1 ratio for text, 3:1 for large UI elements | WCAG 1.4.3 (AA) | | No screen reader support | Semantic UI structure, text alternatives for images | WCAG 1.1.1 | | Fixed UI scale | Independent UI scaling separate from resolution | XAG 102 | | Photosensitive content | No flashing above 3Hz, option to disable screen effects | WCAG 2.3.1 | | Motion-intensive effects | Motion reduction toggle (camera shake, screen bob, parallax) | WCAG 2.3.3 |

Pillar 2: Auditory

Players who are deaf, hard of hearing, or playing without sound.

| Barrier | Solution | Standard | |---------|----------|----------| | Audio-only critical info | Visual equivalent for every audio cue (directional indicators, alerts) | XAG 107 | | No subtitles | Subtitle system with speaker identification | XAG 107 | | No captions | Descriptive captions for non-speech sounds [explosion nearby] | GAG intermediate | | Mixed audio levels | Independent volume sliders per channel (music, SFX, voice, ambient) | XAG 107 | | Directional audio cues | Visual directional indicators (damage direction, footstep radar) | GAG advanced | | Voice chat dependency | Text chat alternative, ping systems, visual callouts | XAG 107 |

Pillar 3: Motor

Players with limited mobility, dexterity, or stamina — including temporary conditions (broken arm, RSI).

| Barrier | Solution | Standard | |---------|----------|----------| | Hardcoded controls | Full remapping for ALL inputs, no exceptions | XAG 104 | | Hold-to-activate only | Toggle/hold option for every sustained input (sprint, aim, crouch) | XAG 104 | | Rapid button mashing | Alternative input (hold, auto-complete, reduced threshold) | GAG intermediate | | Precision timing | Adjustable timing windows, generous input buffers | XAG 109 | | Complex simultaneous inputs | Simplification options, sequential alternatives | GAG advanced | | Fixed sensitivity | Adjustable dead zones, sensitivity curves, acceleration | XAG 104 | | No one-handed play | Alternative control schemes, copilot mode | GAG advanced |

Pillar 4: Cognitive

Players with cognitive disabilities, learning differences, ADHD, anxiety — or anyone overwhelmed by complexity.

| Barrier | Solution | Standard | |---------|----------|----------| | Single difficulty preset | Multiple options, ideally granular per-parameter | XAG 109 | | Unforgiving timing | Pauseable gameplay, adjustable game speed | XAG 109 | | Unclear objectives | Objective markers, quest logs, waypoint systems | GAG basic | | No save flexibility | Save anywhere, generous autosave | GAG basic | | Unreplayable tutorials | Tutorial replay from menu, contextual hints | GAG basic | | Information overload | Adjustable HUD density, progressive disclosure | See player-ux | | Distressing content | Content warnings, option to skip/reduce intensity | GAG intermediate | | Complex navigation | Minimap, breadcrumbs, "return to path" button | GAG intermediate |

Cognitive accessibility has the broadest overlap with general UX quality — this is where accessibility and player-ux (cognitive load management) directly converge.

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Implementation Tiers

Prioritize by ratio of players impacted to implementation cost.

Tier 1: Must-Have (Ship Before Launch)

| Pillar | Feature | Why Tier 1 | |--------|---------|------------| | Visual | No color-only information | ~8-10% of males colorblind; free if designed in | | Visual | Scalable text (min 28px at 1080p) | Large-screen and mobile players need this | | Visual | Contrast ratios (4.5:1 text, 3:1 UI) | WCAG AA baseline | | Visual | Motion reduction option | Vestibular disorders affect ~35% of adults over 40 | | Motor | Remappable controls (every input) | Platform certification requirement | | Motor | Toggle/hold for sustained inputs | Minimal cost, major RSI/mobility impact | | Auditory | Subtitles with speaker identification | ~15% of adults have hearing loss | | Auditory | Independent volume sliders | Standard player expectation | | Cognitive | Difficulty options | Benefits the widest player range | | Cognitive | Pauseable gameplay | Essential for parents, interruptions, anxiety | | Cognitive | Clear objective/waypoint system | Reduces frustration universally |

Tier 2: Should-Have (First Major Update)

| Pillar | Feature | Why Tier 2 | |--------|---------|------------| | Visual | High contrast mode | Growing platform expectation | | Visual | Independent UI scaling | Important for complex HUDs | | Motor | Adjustable timing windows | Major motor accessibility lever | | Motor | One-handed control scheme | Temporary injury, one-arm holds | | Auditory | Visual sound indicators | Essential for deaf/HoH in action games | | Auditory | Descriptive captions | Ambient narrative for deaf/HoH | | Cognitive | Adjustable game speed | Broad benefit; doubles as difficulty lever | | Cognitive | Tutorial replay from menu | Low cost, high value | | Cognitive | Content warnings | Increasingly expected; trivial to implement |

Tier 3: Best-in-Class (Industry Leadership)

| Pillar | Feature | Notes | |--------|---------|-------| | Visual | Screen reader support | Requires semantic UI architecture; plan early if targeting this | | Visual | Full audio descriptions for cutscenes | Significant production cost; high impact for blind players | | Motor | Full input device customization (curves, macros) | Power-user feature with accessibility benefit | | Motor | Copilot mode (two controllers, one character) | Enables assisted play; social accessibility | | Auditory | Text-to-speech for in-game text | Leverages platform TTS APIs | | Cognitive | Adaptive difficulty (invisible) | See progression-systems for implementation patterns | | All | Comprehensive accessibility menu with previews | Let players see the effect of each option before committing |

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Colorblind Design

Common, frequently implemented poorly, and fixable at the design level rather than through post-hoc filters.

Prevalence and Types

| Type | Affects | Confusion Pairs | Prevalence (Males) | |------|---------|-----------------|-------------------| | Protanopia/protanomaly | Red perception | Red-green, red-brown, red-orange | ~6% | | Deuteranopia/deuteranomaly | Green perception | Green-red, green-brown, green-yellow | ~5% | | Tritanopia/tritanomaly | Blue perception | Blue-yellow, blue-green | ~0.01% |

Combined: roughly 1 in 12 males and 1 in 200 females have some form of color vision deficiency.

The Design Rule

Never use color as the sole channel for information. Pair every color distinction with shape, pattern, text, position, size, or brightness. Examples: team indicators use circle vs. triangle (not just red vs. blue), rarity uses border patterns (not just color tints), status effects show names (not just colored icons).

Implementation Approaches (Worst to Best)

| Approach | Problems | |----------|----------| | Hue shift (rotate palette) | Breaks art direction, creates new conflicts | | Palette swap (preset palettes) | Requires maintenance, still color-dependent | | Symbol overlay (shapes on top of color) | Good redundancy, but feels bolted on | | Universal design (base palette works for all) | Best — no "mode" needed, benefits everyone |

Contrast Requirements

| Element | Minimum Ratio | Standard | |---------|--------------|----------| | Body text | 4.5:1 against background | WCAG AA | | Large text (24px+ or 18px+ bold) | 3:1 against background | WCAG AA | | UI components and graphical objects | 3:1 against adjacent colors | WCAG 1.4.11 | | Enhanced (Tier 3 goal) | 7:1 text, 4.5:1 UI | WCAG AAA |

Testing Colorblind Design

Simulate all three types during development using OS-level filters (macOS: Accessibility > Display > Color Filters; Windows: Color Filters). Test every screen where color conveys meaning — minimaps, rarity indicators, health bars, team colors, status effects, quest markers. If you can't distinguish two elements in simulation, players can't either.

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Difficulty and Assist Systems

Difficulty Is an Access Ramp

Difficulty options are the same category of design as remappable controls — different players have different needs, and a single fixed experience excludes people. Reframe: "easy mode" → "flexible difficulty respecting player time and ability"; "assist features" → "player agency over their own experience."

Granular > Preset

Simple Easy/Medium/Hard presets are better than nothing, but granular options give players agency over their specific barriers:

| Parameter | What It Controls | Why Separate | |-----------|-----------------|--------------| | Damage received | Incoming damage multiplier | Player may want challenge but bruise easily | | Damage dealt | Outgoing damage multiplier | Player may want long fights but not impossible ones | | Timing windows | Parry/dodge/QTE timing | Motor accessibility without changing difficulty of everything else | | Resource scarcity | Drop rates, ammo, healing | Exploration vs. survival tension is taste, not skill | | Enemy aggression | How often enemies attack | Pace control | | Navigation assist | Waypoints, pathfinding hints | Cognitive load management | | Aim assist | Auto-aim strength, snap-to-target | Motor + precision accessibility | | Puzzle hints | Hint frequency and directness | Cognitive accessibility without skipping content |

Content Locking

Never lock story, areas, or abilities behind difficulty. Achievements, cosmetics, and leaderboard eligibility are fine difficulty gates — narrative content is not.

Adaptive Difficulty

Invisible adjustment based on player performance — the most accessible approach because it requires zero configuration. Track death frequency, completion time, and resource usage; adjust subtly (fewer spawns, wider timing windows, better drop rates). Never reveal the adaptation and always provide opt-out. See progression-systems for flow channel targeting.

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Subtitle and Caption Design

Bad subtitles are worse than none — they create false confidence that deaf/HoH players are getting the full experience.

Subtitle Requirements

| Element | Requirement | Rationale | |---------|-------------|-----------| | Speaker identification | Name label and/or consistent color per speaker | Players can't identify speakers by voice | | Font size | Adjustable, minimum 24px at 1080p, recommended default 28px | Readability at distance and on small screens | | Background | Semi-transparent letterbox, adjustable opacity (0-100%) | Ensures readability over any scene | | Line count | Maximum 2 lines on screen simultaneously | More lines overwhelm reading speed | | Reading speed | Maximum 150-170 words per minute | Based on comfortable reading pace research | | Positioning | Bottom-center default, adjustable | Different games/screens need different placement | | Formatting | No ALL CAPS for full sentences (reduces readability by ~10%) | Mixed case is faster to read |

Caption Design (Beyond Subtitles)

Captions describe non-speech audio — essential for deaf/HoH ambient narrative and threat awareness.

| Audio Type | Example | |------------|---------| | Environmental | [distant thunder], [rain on metal roof] | | Directional | [footsteps approaching from behind] | | Music/mood | tense orchestral music builds | | Gameplay SFX | [alarm blaring], [shield breaking] | | Off-screen speech | Guard [off-screen]: "Did you hear something?" |

Scaling Reference

Scale proportionally with resolution: 24px minimum at 1080p → 48px at 4K. Recommended defaults: 28px at 1080p, 56px at 4K. Always offer a generous maximum (2x the default).

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Input Accessibility

Remapping Requirements

• Every input must be remappable — no exceptions for "core" actions
• Support per-context remapping (menu vs. gameplay can differ)
• Allow multiple inputs bound to the same action
• Show current bindings in tutorials (don't show "Press X" if rebound to B)
• Detect and warn about conflicts, but allow them
• Persist bindings across sessions

Toggle vs. Hold

Every sustained input needs a toggle/hold setting:

| Action | Hold (Default) | Toggle (Accessible) | |--------|---------------|---------------------| | Sprint | Hold stick + button | Click once to start, once to stop | | Aim down sights | Hold trigger | Click to enter, click to exit | | Crouch | Hold button | Click to crouch, click to stand | | Fly/hover | Hold button | Click to engage, click to disengage |

Input Timing

| Setting | What It Controls | Range | |---------|-----------------|-------| | Dead zone | How far a stick moves before registering | 0-50% (default 15-20%) | | Sensitivity | Input-to-camera/cursor speed | 0.1x-3.0x | | Acceleration | Sensitivity increase with input duration | Off to aggressive | | Input buffer | How long before an action that an input is accepted | 0-500ms | | QTE timing | Time window for quick-time events | 0.5x-3.0x (multiplier on base window) |

Copilot Mode

Two controllers control one character simultaneously — no switching. Enables parent-child assisted play, friend-assisted play for motor disabilities, and therapeutic use. Implementation: merge inputs from both devices, resolve conflicts by last-input-wins.

Touch Accessibility

For mobile/touch-enabled games: minimum 44x44px touch targets (48x48px recommended), 8px minimum spacing between targets, tap alternatives for every swipe/pinch gesture, adjustable touch-and-hold duration (200-1000ms).

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Testing Accessibility

Accessibility testing is not general playtesting — "any 5 players" won't surface accessibility barriers.

Testing Methods

| Method | What It Catches | When to Use | |--------|----------------|-------------| | Automated tools | Contrast violations, missing alt text, color-only indicators | Every build (integrate into CI if possible) | | Simulation testing | Colorblind issues, motion sensitivity, audio-off playthrough | Weekly during active development | | Expert review | Systemic patterns, standard compliance, missed edge cases | Pre-alpha milestone, pre-launch | | Player testing with disabilities | Real-world barrier discovery, assistive tech compatibility | Beta, pre-launch | | Assistive tech testing | Screen reader compatibility, switch controller support | If targeting Tier 3 features |

Simulation Testing Checklist

• [ ] Sound muted — can you complete every objective?
• [ ] Colorblind simulation (all three types) — can you distinguish all meaningful elements?
• [ ] One hand only — is it physically possible?
• [ ] Minimum text size at TV distance — can you read everything?
• [ ] Photosensitive check — any flashing above 3Hz?
• [ ] Keyboard-only (no mouse) — are any features inaccessible?
• [ ] Easiest difficulty — can a player struggling with timing/precision finish the game?

Recruiting Players with Disabilities

Standard playtest recruitment won't surface accessibility barriers. Partner with disability advocacy and gaming organizations, post in disability-focused gaming communities, compensate fairly, and ensure the testing environment itself is accessible. Don't combine accessibility testing with general playtesting — the goals and recruitment differ.

See playtest-design for general methodology, but treat accessibility testing as a specialized discipline.

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Accessibility Health Check

Tier 1 Checklist (Must-Have)

• [ ] No information conveyed by color alone — every color distinction has a redundant channel
• [ ] Text scales to at least 28px at 1080p — body text, UI labels, item descriptions
• [ ] Contrast ratios meet WCAG AA — 4.5:1 for text, 3:1 for UI
• [ ] All controls are remappable — no hardcoded bindings
• [ ] Toggle/hold option exists for every sustained input
• [ ] Subtitles are available with speaker identification
• [ ] Independent volume controls for music, SFX, voice (minimum)
• [ ] At least three difficulty options, or granular difficulty parameters
• [ ] Game can be paused at any time during gameplay (exception: competitive multiplayer)
• [ ] Clear objective/waypoint system is available (can be toggled off for players who prefer exploration)
• [ ] Motion reduction option exists (camera shake, screen effects, parallax)
• [ ] No flashing content above 3Hz, or a reliable skip/reduce option
• [ ] Tutorials explain mechanics clearly and can be dismissed

Tier 2 Checklist (Should-Have)

• [ ] High contrast mode available for UI elements
• [ ] UI scales independently from game resolution
• [ ] Timing windows for QTE/parry/dodge are adjustable
• [ ] One-handed control scheme is possible (even if simplified)
• [ ] Visual indicators exist for all gameplay-relevant sounds
• [ ] Descriptive captions available for non-speech audio
• [ ] Game speed is adjustable (0.5x-1.0x minimum)
• [ ] Tutorials can be replayed from the menu
• [ ] Content warnings precede distressing scenes
• [ ] Subtitle font size, background opacity, and position are adjustable

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Anti-Patterns

| Anti-Pattern | Better Approach | |-------------|-----------------| | Single "Accessibility Mode" toggle | Individual toggles per feature — players need some but not all | | Colorblind mode = hue shift filter | Redesign palette for universal clarity; use redundant channels | | "Git gud" as response to accessibility requests | Offer options; never gatekeep the experience | | Unskippable cutscenes | Always skippable or pauseable | | Rapid button-mashing with no alternative | Hold-to-complete or auto-complete alternative | | Tiny text, no scaling | Always support text scaling with a generous range | | "We'll add accessibility later" | Design accessible from the start — retrofitting is expensive | | Accessibility settings buried in sub-menus | Surface in first-run setup; dedicated section in main settings | | Fixed subtitle appearance | Adjustable font size, background opacity, color, and position | | Audio-only threat indicators | Pair every audio cue with a visual indicator | | Auto-advancing dialogue | Player-paced advancement (press to continue) |

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Cross-References

| Skill | Intersection | |-------|-------------| | player-ux | Cognitive load overlaps cognitive accessibility; perception framework informs visual | | game-feel | Juice/feedback must include motion reduction; screen shake needs opt-out | | encounter-design | Difficulty and pacing are primary motor/cognitive accessibility levers | | progression-systems | Adaptive difficulty is invisible accessibility; flow channel targeting | | game-design | 5-Component Filter Clarity overlaps cognitive/visual accessibility | | experience-design | Pacing must accommodate players needing more time or different inputs | | playtest-design | Accessibility testing needs specialized recruitment | | narrative-design | Subtitles/captions, content warnings, dialogue pacing | | multiplayer-design | Communication accessibility, competitive fairness with assists | | game-balance | Granular difficulty parameters need their own balance passes |