How to Build a Web3 Game on Solana: Architecture That Works

The Web3 games that last have one thing in common: they're games first. The blockchain adds real ownership and new economies, but it stays out of the way of the fun. Solana is a strong fit because transactions are fast and cheap enough to use during play, not just in a marketplace.

This guide covers the architecture decisions that make or break a Web3 game.

Decide what goes on-chain

Putting everything on-chain is rarely the right call. A useful rule: put on-chain what players need to own or trust, and keep the rest fast and off-chain.

Usually on-chain	Usually off-chain
Items and characters players own	Moment-to-moment gameplay
Premium currency and rewards	Matchmaking and chat
Trades between players	Animations, physics, rendering
Tournament entry and prizes	Most progress and stats

Some games go further and run their core logic fully on-chain. That's possible on Solana with real-time layers such as MagicBlock's Ephemeral Rollups, where game accounts are delegated to a fast execution layer during a session and settled back to Solana afterwards.

Items players truly own

Game items as NFTs let players keep, trade and sell what they earn. Two common choices:

• Metaplex Core for valuable or unique items, with plugins for on-chain attributes a game can read and update.
• Compressed NFTs for items minted to many players at very low cost: badges, cosmetics, consumables.

We compare these in in-game items as NFTs.

In-game currencies

Many games use two currencies: a soft currency earned through play, and a premium or tradable token. Tokenising currency is powerful but risky: if rewards outpace what players spend, the economy inflates and collapses. Design sinks (things to spend on) alongside sources. More in designing a Web3 game economy.

Sign-in without losing players

Asking a new player to install a wallet before playing loses most of them. Better options:

• Email or social sign-in with an embedded wallet, created for the player in the background, which they can export later.
• Wallet sign-in for crypto-native players who already use Phantom or Solflare.

No pop-up for every move

Nobody wants to approve a wallet pop-up every time they attack. Session keys solve this: the player approves a play session once, creating a temporary key limited to your game's program, with an expiry. The game then signs routine actions with it.

Engines and platforms

• Unity games use the open-source Solana Unity SDK, which covers wallets, NFTs, transactions and session keys.
• Web games built with React, Phaser or Three.js use Solana's JavaScript libraries directly.
• Mobile games can use the Solana Mobile Stack.

Launch checklist

• Playtest the fun before adding tokens.
• Model the economy with realistic player numbers.
• Test on devnet, including what happens when many players act at once.
• Get the programs that hold value security reviewed.

Build it with us

We add Web3 features to existing games and build new on-chain games on Solana: items, economies, sign-in, session keys and the programs behind them. See our Web3 gaming service.