agentmods.dev

2d-games

2d-games is a skill for Claude Code from bcastelino/agent-skills-kit. It costs 20 tokens per session (540 once invoked), scanned A, a copy of 2d-games, MIT.

A guide to building two-dimensional games, where play happens across a flat screen rather than in a 3D world. It covers sprites, tilemaps, physics, and cameras.

In plain words
What is it for?
Use it when designing 2D game systems such as animated characters, tile-based levels, collision shapes, physics timing, and camera behavior.
Why use it?
It provides practical rules for organizing game graphics, levels, movement, collisions, and scrolling views.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the game-development plugin — 11 skills shipped together

not rated 2repo 3mo ago A scan 20 tokens copy · 92% MIT

Good fit Use it when designing 2D game systems such as animated characters, tile-based levels, collision shapes, physics timing, and camera behavior.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bcastelino/agent-skills-kit/2d-games
View source ↗ bcastelino/agent-skills-kit
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add bcastelino/agent-skills-kit --skill 2d-games
Clone the repo
git clone --depth 1 https://github.com/bcastelino/agent-skills-kit

Made for: Claude Code.

Or install game-development, the plugin that ships this one along with the rest of its 11 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for 2d-games

README.md
[![agentmods](https://agentmods.dev/badge/skills/bcastelino/agent-skills-kit/2d-games/github.svg)](https://agentmods.dev/skills/bcastelino/agent-skills-kit/2d-games)
Your own site
<a href="https://agentmods.dev/skills/bcastelino/agent-skills-kit/2d-games"><img src="https://agentmods.dev/badge/skills/bcastelino/agent-skills-kit/2d-games/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for 2d-games

Your own site · 80×15
<a href="https://agentmods.dev/skills/bcastelino/agent-skills-kit/2d-games"><img src="https://agentmods.dev/badge/skills/bcastelino/agent-skills-kit/2d-games.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 540 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 92% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00020 $0.00540
Opus 5.5 $0.00008 $0.00216
Sonnet 5.5 $0.00004 $0.00108
Haiku 4.5 $0.00002 $0.00054

Measured 2mo ago against content hash c76a366740d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

2d-games scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

92% identical to 2d-games — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/game-development/2d-games/SKILL.md · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.

2D Game Development

Principles for 2D game systems.

1. Sprite Systems

Sprite Organization

Component Purpose
Atlas Combine textures, reduce draw calls
Animation Frame sequences
Pivot Rotation/scale origin
Layering Z-order control

Animation Principles

  • Frame rate: 8-24 FPS typical
  • Squash and stretch for impact
  • Anticipation before action
  • Follow-through after action

2. Tilemap Design

Tile Considerations

Factor Recommendation
Size 16x16, 32x32, 64x64
Auto-tiling Use for terrain
Collision Simplified shapes

Layers

Layer Content
Background Non-interactive scenery
Terrain Walkable ground
Props Interactive objects
Foreground Parallax overlay

3. 2D Physics

Collision Shapes

Shape Use Case
Box Rectangular objects
Circle Balls, rounded
Capsule Characters
Polygon Complex shapes

Physics Considerations

  • Pixel-perfect vs physics-based
  • Fixed timestep for consistency
  • Layers for filtering

4. Camera Systems

Camera Types

Type Use
Follow Track player
Look-ahead Anticipate movement
Multi-target Two-player
Room-based Metroidvania

Screen Shake

  • Short duration (50-200ms)
  • Diminishing intensity
  • Use sparingly

5. Genre Patterns

Platformer

  • Coyote time (leniency after edge)
  • Jump buffering
  • Variable jump height

Top-down

  • 8-directional or free movement
  • Aim-based or auto-aim
  • Consider rotation or not

6. Anti-Patterns

❌ Don't ✅ Do
Separate textures Use atlases
Complex collision shapes Simplified collision
Jittery camera Smooth following
Pixel-perfect on physics Choose one approach

Remember: 2D is about clarity. Every pixel should communicate.

Read the full file on GitHub · 119 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 119 lines · 20 tokens per session scan A c76a366740d9

Subscribe to this mod's changes

2d-games is a skill published in the GitHub repository bcastelino/agent-skills-kit (2 stars, last pushed 3mo ago), licensed MIT. It adds 20 tokens to every session and 540 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 92% identical to 2d-games, differing in 3 lines, and is treated as a copy.

Claude CodeGame developmentagent-skill-repositoryagent-skillsai-agentsantigravityclaude-code-plugin
Related

2d-games compared with skills from other repositories

2d-games next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
2d-gamesbcastelino/agent-skills-kitSkill23mo agoMITA20Claude Code
researcherkeli-wen/agy-staffSkill8692d agoMITA75Claude Code
reviewerkeli-wen/agy-staffSkill8692d agoMITB94Claude Code
cloudflare-durable-objectssecondsky/claude-skillsSkill24814d agoMITA43Claude Code
dead-code-huntermagic5644/Graph-It-LiveSkill63yesterdayMITA165Claude Code
onboarding-expressmagic5644/Graph-It-LiveSkill63yesterdayMITA171Claude Code
debugging-workflowsCrowdStrike/foundry-skillsSkill39yesterdayMITA90Claude Code