Fifth Door is building a platform that lets everyone create and play games with AI in any setting and with anyone. The company aims to make game development, distribution, and play accessible to all, fostering imagination, social connection, and enjoyment through interactive experiences. Co-founder Daniel Kan previously built Exec (YC W12) and was part of Cruise (YC W14). Fifth Door was founded in 2025 and is part of Y Combinator's Fall 2025 batch.
Fifth Door
ActiveCreate and play games with AI
Total raised
$500K
1 round
Stage
Seed
Jan 2025
Team
1-10
since 2025
Pricing
—
Founded
2025
San Francisco, United States
Agent-ready
—
Platform to create and play games with AI
Makes game development accessible to non-developers
Supports game distribution alongside creation
Designed for social, multiplayer play
Focus on imagination and interactive experiences
Play games in any setting and with anyone
Lowers the barrier to building interactive games
Founded by a team with prior startup and Cruise experience
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Jan 2025 Seed $500K ● Y Combinator
Capital network
$500K raised ·1 backer·10 network links
- Backers1
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
General Intuition
Frontier lab training spatial-temporal AI agents on video game clips
Foundation ModelsAI Gaming
Scenario
Creative AI infrastructure for generating game-ready art assets at scale
AI DesignAI Gaming
Nunu.ai
AI Gaming
Artificial Agency
AI behavior engine that makes video game NPCs feel alive and reactive
AI AgentsAI Gaming
Moonlake AI
AI Gaming
Kaedim
Turn 2D images and concept art into production-ready 3D models in minutes
3D GenerationAI Gaming
- What is Fifth Door?
- Fifth Door is a platform that lets anyone create and play games with AI, making game development, distribution, and play accessible to everyone.
- Do I need coding skills to use it?
- No. The platform is designed to make game development accessible to all, so people can create games with AI rather than writing code from scratch.
- What does Fifth Door emphasize?
- It focuses on imagination, social connection, and fun through interactive experiences that can be played in any setting and with anyone.
- Who is behind Fifth Door?
- Co-founder Daniel Kan previously built Exec and was part of Cruise. Fifth Door was founded in 2025 and is part of Y Combinator's Fall 2025 batch.
- Can I share games I create?
- Yes. The platform supports distribution alongside creation and play, so games made on it can be shared with others.
Discussion
Sign in to join the discussion.
Sign inExplore more around Fifth Door
Contextual paths to related AI startups, deals and rankings.