• By Sanjay Dey
• 12 May, 2025
• App Development

🚀 Unity Photon Versions Explained: Choosing the Right Photon for Your Multiplayer Game

Photon is one of the most popular multiplayer networking solutions for Unity developers. Whether you're building a real-time shooter, card game, racing game, or MMO, Photon offers multiple versions—each optimized for different game types, scale, and complexity. In this post, we’ll break down: All major Photon versions available for Unity What each version is best for Real-world examples of games built using each version A clear summary and recommendation guide

Photon is one of the most popular multiplayer networking solutions for Unity developers. Whether you're building a real-time shooter, card game, racing game, or MMO, Photon offers multiple versions—each optimized for different game types, scale, and complexity.

In this post, we’ll break down:

• All major Photon versions available for Unity

• What each version is best for

• Real-world examples of games built using each version

• A clear summary and recommendation guide

🧠 What Is Photon?

Photon is a suite of networking SDKs built by Exit Games that powers real-time multiplayer experiences across platforms. Unlike traditional servers you manage yourself, Photon offers cloud-hosted (and self-hosted) networking backends with matchmaking, room management, and event syncing.

🧩 Photon Versions for Unity

Photon offers four major networking solutions compatible with Unity:

1. Photon PUN (Photon Unity Networking)

2. Photon PUN 2

3. Photon Realtime

4. Photon Fusion

5. Photon Quantum

Let’s explore each.

🔷 1. Photon PUN (Classic)

Status: Deprecated
Type: High-level API
Use Case: Casual synchronous games
Architecture: Room-based (client-authoritative)

🔍 Best For:

• 2D/3D turn-based or synchronous games

• Small room-based multiplayer games (e.g., Tic Tac Toe, simple co-op)

🎮 Example:

• A basic 2-player Unity chess game with synced moves.

🚫 Limitations:

• Not optimized for competitive real-time gameplay

• Deprecated and replaced by PUN 2

🔷 2. Photon PUN 2

Status: Supported
Type: High-level API (layered over Realtime)
Use Case: Quick multiplayer prototypes and small games
Architecture: Client-authoritative, room-based

🔍 Best For:

• Casual games (card games, board games)

• Turn-based or light real-time games

🎮 Example:

• Rummy, Ludo, or a multiplayer quiz app

✅ Advantages:

• Super easy to set up

• Integrated matchmaking and room handling

• Excellent documentation and community

🚫 Not Ideal For:

• High-frequency real-time games like FPS or racing

• Cheating can be a concern (client-authority model)

🔷 3. Photon Realtime

Status: Supported
Type: Lower-level API
Use Case: Custom multiplayer architecture
Architecture: Client-authoritative or hybrid

🔍 Best For:

• Developers who need more control than PUN

• Backend integration with matchmaking or custom logic

🎮 Example:

• A cross-platform card battle game using your own backend

• Mobile games with social lobbies and friends list

✅ Advantages:

• More control over networking and events

• Backend extensibility (Photon Server SDK available)

🚫 Requires more boilerplate than PUN

⚡ 4. Photon Fusion

Status: Active and growing
Type: High-performance real-time networking
Use Case: Competitive real-time games
Architecture: Client-hosted, shared-host, or dedicated server

🔍 Best For:

• FPS, Battle Royale, Racing, Platformers

• Games that need deterministic sync or state rollback

🎮 Example:

• Kart racing game with real-time combat and boosts (like Sanjay Dey’s Race Jackpot Rally)

• Multiplayer platformer or PvP shooter

✅ Advantages:

• Lag compensation, input prediction, rollback netcode

• Host migration and simulation

🚫 Learning curve is steeper than PUN

🧠 5. Photon Quantum

Status: Premium / Enterprise
Type: Deterministic ECS-based simulation
Use Case: Competitive eSports-grade real-time games
Architecture: Server-authoritative (deterministic)

🔍 Best For:

• Frame-accurate multiplayer games

• eSports games, fighting games, physics-heavy real-time games

🎮 Example:

• MOBA, RTS, Fighting games (like Super Smash Bros)

• eSports-grade card games where fairness and frame-locking matter

✅ Advantages:

• Fully deterministic, no lag cheating

• Real-time rollback and simulation accuracy

🚫 Expensive and overkill for casual games

🚫 Requires significant planning and ECS architecture

🧮 Comparison Table

🏁 Which Photon Version Should You Use?

Here’s a quick guide:

• Use PUN 2 for:
  Card games, turn-based games, simple real-time interactions

• Use Photon Realtime if:
  You need deeper backend integration, analytics, or matchmaking

• Use Photon Fusion for:
  High-speed action games, e.g., Kart Racing, Shooters, Platformers

• Use Photon Quantum when:
  You’re building AAA-grade multiplayer requiring rollback and deterministic simulation

✅ Summary

Photon’s networking stack scales from prototypes to AAA production. Choosing the right version depends on your game's genre, real-time requirements, and technical goals.

🚨 Pro Tip:

For most indie and mobile games, start with PUN 2 or Fusion. Move to Quantum only if your game needs deterministic lockstep simulation and you're building for esports scale.