# Game Feel

> >

- **Type:** Skill
- **Install:** `agentstack add skill-gamedev-skills-awesome-gamedev-agent-skills-game-feel`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [gamedev-skills](https://agentstack.voostack.com/s/gamedev-skills)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** Apache-2.0
- **Upstream author:** [gamedev-skills](https://github.com/gamedev-skills)
- **Source:** https://github.com/gamedev-skills/awesome-gamedev-agent-skills/tree/main/skills/disciplines/game-feel

## Install

```sh
agentstack add skill-gamedev-skills-awesome-gamedev-agent-skills-game-feel
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Game feel (juice)

The difference between a mechanic that *works* and one that feels *good* is feedback: the
layered, slightly-exaggerated response an action provokes. This skill covers the engine-
neutral techniques — screen shake, hit-stop, easing, squash & stretch, knockback, and stacked
feedback — and tells you how to apply them without burying the underlying simulation. It
**adds polish on top of** an existing mechanic; it does not implement the mechanic.

## When to use

- Use when an action (hit, jump, dash, pickup, death, button press) is mechanically correct
  but feels weak, weightless, or unsatisfying, and you want it to feel responsive and punchy.
- Use to add screen shake, hit-stop/freeze frames, eased motion, squash & stretch, knockback,
  flashes, or to layer multiple feedback channels onto one event.
- Use to decide *how much* juice is enough and where it crosses into noise.

**When *not* to use:** for the raw controller math (jump height, coyote time) use the
`platformer` genre and the engine movement skill. For camera *follow/deadzone/orbit* framing
use `camera-systems` (this skill only triggers the shake). For mixing, ducking, and adaptive
music use `audio-design`. For shader-based dissolves/flashes use `shader-programming` and the
engine shader skill. For the concrete tween/particle node APIs, use the engine animation skill
(`godot-animation`, `unity-animation`).

## Core principle: feedback is layered and exaggerated

One satisfying hit is usually **5–8 tiny responses firing together** within ~100 ms: a sound,
a particle burst, a brief hit-stop, a flash, a knockback, a small screen shake, and a number
popping up. Each is cheap; stacked, they read as "impact". Two rules keep it from becoming a
mess: **(1)** exaggerate *briefly* and return to rest (juice is transient, not a new resting
state); **(2)** scale juice to event importance — a footstep is not a boss death.

## Core workflow

1. **Confirm the event hooks exist.** Juice attaches to discrete events: `on_hit`, `on_land`,
   `on_pickup`, `on_death`, `on_fire`. If the mechanic doesn't emit these, add them first.
2. **Pick feedback channels per event** from the menu (sound, particles, shake, hit-stop,
   flash, knockback, tween, number pop). Start with 2–3; add until it reads, then stop.
3. **Make motion eased, not linear.** Route scale/position/UI changes through a tween with an
   ease (overshoot for "pop", ease-out for "settle"). Linear motion feels robotic.
4. **Reserve hit-stop and shake for impact.** They are the strongest, most abusable tools —
   short durations, scaled to importance, and never on routine actions.
5. **Keep feedback off the critical simulation.** Shake moves the *camera/visual*, not the
   body; hit-stop uses time scale or a real-time pause, not a gameplay-logic stall.
6. **Tune by importance tiers.** Define small/medium/large feedback presets and assign events
   to a tier, so the whole game's juice stays consistent and proportional.
7. **Verify by playing and watching.** Trigger the event repeatedly; confirm the feedback
   fires, returns to rest, and is not nauseating or input-blocking. Report what you observed
   (does shake decay? does input still register during hit-stop?).

## Patterns

### 1. Screen shake by decaying "trauma" (smooth, not a random jitter)

```gdscript
# Godot 4.x. Store trauma 0..1; shake = trauma^2 so small hits barely move, big hits punch.
# Drives a Camera2D OFFSET (the visual), never the player body. Decays every frame.
@export var decay := 1.2          # trauma lost per second
@export var max_offset := Vector2(12, 8)
@export var max_roll := 0.1       # radians
var trauma := 0.0
var _t := 0.0

func add_trauma(amount: float) -> void:
    trauma = clampf(trauma + amount, 0.0, 1.0)   # hits ADD; they don't reset

func _process(dt: float) -> void:
    if trauma  void:
    Engine.time_scale = scale
    # 4th arg ignore_time_scale=true → the timer still fires while the game is frozen.
    await get_tree().create_timer(duration, true, false, true).timeout
    Engine.time_scale = 1.0
```

```csharp
// Unity 6 (C#). WaitForSecondsRealtime ignores Time.timeScale, so the timer still elapses.
IEnumerator HitStop(float duration = 0.08f, float scale = 0.05f) {
    Time.timeScale = scale;
    yield return new WaitForSecondsRealtime(duration);
    Time.timeScale = 1f;            // RIGHT: real-time wait. WRONG: WaitForSeconds (never resumes at scale 0)
}
```

### 3. Squash & stretch + overshoot via an eased tween (the "pop")

```gdscript
# Godot 4.x. Conserve volume: stretch one axis, squash the other, then spring back with overshoot.
func pop(node: Node2D) -> void:
    node.scale = Vector2(1.3, 0.7)                       # instant squash on the event
    var tw := create_tween()
    tw.tween_property(node, "scale", Vector2.ONE, 0.18) \
      .set_trans(Tween.TRANS_BACK).set_ease(Tween.EASE_OUT)   # BACK = overshoots past 1, settles
# RIGHT: ease back (TRANS_BACK/ELASTIC) for life. WRONG: linear tween → mechanical, dead.
```

### 4. A feedback bundle scaled by importance (keep juice proportional)

```gdscript
# One call per event; the tier decides intensity so the whole game stays consistent.
func feedback(event_pos: Vector2, tier: String) -> void:
    match tier:
        "small":  AudioBus.play("tick");  Camera.add_trauma(0.15)
        "medium": AudioBus.play("hit");   Camera.add_trauma(0.4);  hit_stop(0.05); spawn_particles(event_pos, 6)
        "large":  AudioBus.play("boom");  Camera.add_trauma(0.8);  hit_stop(0.12); spawn_particles(event_pos, 30); flash_white(0.06)
```

## Pitfalls

- **Shaking the player/body instead of the camera offset** desyncs collision and aim. Shake
  the camera (or a visual pivot), never the simulated transform.
- **Random offset every frame** buzzes like static. Drive shake from sampled noise/sin and a
  decaying trauma value so it's smooth and self-ending.
- **Hit-stop with `WaitForSeconds` / a scaled timer** never resumes (at time scale 0 the timer
  never advances). Use a real-time wait (`WaitForSecondsRealtime`, or Godot's
  `ignore_time_scale` timer).
- **Hit-stop on every frame of a held attack** locks the game. Trigger it once per impact.
- **Linear tweens everywhere** feel robotic. Ease almost everything; reserve overshoot
  (BACK/ELASTIC) for "pop" and ease-out for "settle".
- **Permanent exaggeration** (scale never returns, shake never decays) becomes the new normal
  and stops reading as feedback. Juice must return to rest.
- **Over-juicing routine actions** (full shake + hit-stop on every footstep) causes nausea and
  hides real impacts. Scale to importance; add a "reduce screen shake"/"reduce flashing"
  accessibility option.
- **Feedback that blocks input** (long freeze, un-cancelable animation) hurts responsiveness.
  Keep juice short and let input buffer through it.

## References

- For the trauma-shake math, easing-curve cheat sheet (which ease for pop vs settle), knockback
  + flash + number-pop recipes, importance-tier presets, and per-engine tween/particle bindings,
  read `references/feedback-recipes.md`.

## Related skills

- `camera-systems` — owns camera follow/deadzone/orbit; this skill only feeds it shake trauma.
- `godot-animation`, `unity-animation` — concrete tween/AnimationPlayer/particle APIs juice rides on.
- `audio-design` — the sound layer of every feedback bundle; ducking and SFX variation.
- `physics-tuning` — knockback forces and the timestep juice must not destabilize.
- `platformer`, `fps-shooter`, `roguelike` — genres whose moment-to-moment feel this elevates.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [gamedev-skills](https://github.com/gamedev-skills)
- **Source:** [gamedev-skills/awesome-gamedev-agent-skills](https://github.com/gamedev-skills/awesome-gamedev-agent-skills)
- **License:** Apache-2.0

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-gamedev-skills-awesome-gamedev-agent-skills-game-feel
- Seller: https://agentstack.voostack.com/s/gamedev-skills
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.