game-feel

name

game-feel

description

Juice, feedback layering, screen shake/particles/sound timing, the perception-action cycle, and 'why does this feel bad?' diagnostics. Use when implementing player actions, combat hits, collectibles, UI transitions, weapon impacts, jumps, dashes, or any moment where the player should *feel* something; when a mechanic functionally works but feels mushy, slow, or unsatisfying; or when playtesters say 'it's missing something.' Covers timing reference numbers (frames per response phase), feedback channels (visual/audio/haptic/screen), and the diagnostic ladder for feel problems.

Game Feel

Purpose: Make every player action feel responsive, satisfying, and communicative. Game feel is the difference between "it works" and "it feels great." These are the tools to close that gap.

Sources: Steve Swink, Game Feel: A Game Designer's Guide to Virtual Sensation (Morgan Kaufmann, 2008) — the foundational text, and the origin of the term. Juice technique follows Martin Jonasson & Petri Purho, "Juice it or lose it" (Nordic Game Jam 2012) and Jan Willem Nijman, "The Art of Screenshake" (INDIGO 2013). Perception and feedback-legibility claims draw on Celia Hodent, The Gamer's Brain (2017). Specific timing values are starting points, not measurements — see the Numbers Policy in game-design.

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Core Framework: Three Feedback Layers

Every player action should produce feedback on three layers, and all three must align:

Layer	What Changes	Example
Mechanical	Game state updates	HP decreases, score increases, position changes
Audiovisual	Sensory response	Screen shake, particles, sound effect, animation
Emotional	Player feeling	Satisfaction, tension, surprise, power

When layers misalign, something feels "off" even if the player can't explain it:

• Mechanical hit + weak audiovisual = "it didn't feel like I hit them"
• Big audiovisual + no mechanical change = "all flash, no substance"
• Mechanical + audiovisual aligned but wrong emotion = "it feels weird"

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The Perception-Action Cycle

For feedback to register, it must pass three gates:

Action → [Perceivable?] → [Interpretable?] → [Timely?] → Registered
             ↓                  ↓                  ↓
          "I didn't see it"  "What happened?"  "It feels laggy"

Gate 1: Perceivable

Can the player actually detect the feedback?

• Does it have sufficient visual contrast against the current scene?
• Is it large enough / loud enough for the context?
• Does it use a channel the player is monitoring? (Don't put critical info in a corner during action)
• Does it work for players with visual/auditory limitations?

Gate 2: Interpretable

Does the player understand what the feedback means?

• Does the feedback match the player's mental model? (Hit = damage, collect = got it)
• Is there a consistent language? (Red = damage, green = heal, across the whole game)
• Can a new player understand it without explanation?
• Does it distinguish between similar events? (Light hit vs. heavy hit, near miss vs. clean dodge)

Gate 3: Timely

Is the feedback close enough in time to the action?

Threshold	Feel
< 50ms	Instant — player perceives cause and effect as simultaneous
50-100ms	Responsive — feels connected but has presence
100-200ms	Noticeable — acceptable for weighty/heavy actions
> 200ms	Laggy — feels disconnected; only acceptable for explicitly slow/telegraphed actions

Rule: Immediate visual feedback within 1-2 frames (16-33ms), even if the full animation plays out over longer. The onset must be instant.

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The Juice Checklist

"Juice" is small feedback amplification with outsized impact on feel. These techniques don't change game state — they change experience.

Impact / Hit Juice

• Screen shake — intensity proportional to hit magnitude (2-5px for light hits, 8-15px for heavy)
• Hit stop / freeze frame — 2-5 frame pause on impact (30-80ms) sells the weight
• Particle burst — directional, from impact point
• Sound effect — layered (impact + reaction + environmental response)
• Knockback / recoil — both target and attacker react physically
• Camera punch — brief zoom or push toward impact point
• Flash / color shift — 1-2 frame white flash on the hit target

Collection / Pickup Juice

• Magnetism — items drift toward player in the last few pixels
• Pop animation — item scales up briefly before disappearing
• Sound — pitch variation on rapid sequential pickups (ascending pitch = satisfying)
• Number popup — value floats up and fades
• UI pulse — the relevant counter/bar flashes or bounces

Movement Juice

• Squash and stretch — character compresses on land, stretches on jump
• Dust/particles — on landing, on dash, on direction change
• Trail effects — afterimages, motion blur, speed lines
• Camera lead — camera slightly ahead of movement direction
• Sound — footsteps with surface-appropriate variation

UI Transition Juice

• Easing curves — never linear; ease-out for appearing, ease-in for disappearing
• Overshoot — slight bounce past target position
• Stagger — sequential items animate with slight delay between each
• Sound — subtle confirmation sounds on state changes

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"Why Does This Feel Bad?" Diagnostic

When something feels wrong, diagnose systematically:

Step 1: Identify the Symptom

Player Says	Likely Layer	Start Here
"It's laggy"	Timing	Check input-to-visual-response latency
"It feels weak"	Audiovisual	Add juice (hit stop, shake, sound)
"It didn't register"	Perception	Increase feedback visibility/contrast
"It's confusing"	Interpretation	Clarify feedback language, reduce noise
"It's floaty"	Timing + AV	Add gravity, weight, impact frames
"It's clunky"	Timing	Check cancel windows, input buffering
"It's boring"	Emotional	Layer isn't producing the intended feeling

Step 2: Check Timing

• Measure actual input-to-response latency (not estimated — use frame-by-frame analysis)
• Compare against the threshold table above
• Check if input buffering is working (player presses attack during recovery — does it queue?)
• Check cancel windows (can the player interrupt one action with another when expected?)

Step 3: Check Proportionality

• Is feedback intensity proportional to action significance?
• Are trivial actions quiet and major actions loud?
• Is there dynamic range? (If everything shakes, nothing shakes)

Step 4: Check Redundancy

Critical feedback should use 2+ channels:

Visual + Audio     (minimum for any significant action)
Visual + Audio + Haptic    (ideal for core loop actions)
Visual + Audio + Camera    (for high-impact moments)

Relying on a single channel means some players will miss it.

Step 5: Check for Feedback Lies

Does the feedback match what actually happened?

• Animation says "hit" but damage didn't register → trust gap
• Sound plays but no visual confirmation → feels ghostly
• Big particle effect on a weak attack → expectation violation
• Hit stop on a miss → false positive

Feedback lies erode trust faster than missing feedback.

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Timing Reference Card

All values below are starting points — tune through playtesting per the Numbers Policy in game-design.

Action Type	Visual Onset	Full Duration	Sound Onset	Notes
Light attack	1-2 frames	200-400ms	On contact frame	Quick, snappy
Heavy attack	3-5 frame windup	400-800ms	On contact + windup sound	Telegraphed weight
Jump	1 frame	Duration of jump	On launch	Squash on takeoff, stretch at apex
Land	1-2 frames	100-200ms	On contact	Squash, particles, camera dip
Collect	Instant	200-400ms fade	On contact	Magnet + pop + counter pulse
Damage taken	1 frame flash	200-500ms	On contact	Screen edge vignette, sound, shake
Death	3-5 frame slow	500ms-2s	Dramatic sting	Time slow, camera pull, fade

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Anti-Patterns

• Silent actions — any player action with no perceivable response
• Uniform intensity — same screen shake for a poke and a meteor strike
• Over-juicing — so many particles and shakes that the game is unreadable
• Feedback without meaning — visual noise that doesn't communicate game state
• Animation priority over responsiveness — finishing a pretty animation at the cost of input responsiveness
• Same sound on repeat — rapid repeated actions need pitch/timing variation or they become grating

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Cross-References

Three tight links. Everything else routes through the map, so adding a skill touches one file rather than twenty: references/routing-map.md (in game-design).

• player-ux — Perception limits decide what feedback can register at all
• game-design — Satisfaction and Clarity in the 5-Component Filter
• game-perf — Juice costs frames; the budget is real