Blockchain game development: architecture, wallets and budgets

Blockchain game development in 2026 mostly means building a normal game in Unity, Unreal or a web engine, and putting a small, deliberate slice of it on-chain: item ownership, a marketplace, maybe a currency. Game logic stays on your servers unless you are building a fully on-chain game on purpose. Players should never see a seed phrase or a gas fee, and the token economy should come last, after you know people enjoy the game without it.

That order sounds obvious. Most of the projects that failed in the last cycle did it backwards.

Start with a hard question: does the game need a chain?

Funding for blockchain games has collapsed from the 2021 to 2022 peak. DappRadar's Q2 2025 report counted $73 million raised that quarter, down 93% year over year, and around 300 gaming dapps active in Q1 2025 showed no on-chain activity in Q2. Investors now ask what ownership adds to the player's experience, and "play to earn" is not an answer they accept.

Good reasons to use a chain:

• Players trade items with each other and you want that market to be open, auditable and outside your support queue.
• Items or characters should work across games or survive your servers shutting down.
• User-generated content, where creators earn royalties on what they make.
• A fully on-chain game where the rules themselves are the product and anyone can build clients or mods.

Weak reasons: "we want a token", "NFTs raise money", "web3 users are a marketing channel". Those lead to an economy before a game.

Architecture: three models

Off-chain game, on-chain assets

This is where we would start almost every team. The server is authoritative for gameplay. When a player earns or buys an item, the server mints or transfers a token; when they equip it, the client reads ownership from an indexer, not from the chain on every frame. Real-time multiplayer, anti-cheat and matchmaking work exactly as they do in any other game.

The engineering work that people underestimate is reconciliation. A player sells a sword on a marketplace while it is equipped in a live match. Who wins? You need rules for locking, a ledger on your side, and an indexer that sees transfers within seconds. Budget for that indexer from day one.

Hybrid

Here the server still runs the game, but some results get committed on-chain: tournament payouts, crafting recipes that burn inputs, season rankings. This makes the economy auditable, which matters if items have real value. The tradeoff is more contract code that holds value, and every one of those contracts needs testing and an external review. Use our smart contract audit checklist before anything with a marketplace or a payout ships.

Fully on-chain

Fully on-chain games keep all state in contracts. Frameworks exist for this: on Starknet, Dojo provides a Cairo-native entity component system plus the Torii indexer and Katana sequencer, and on EVM chains MUD gives you a similar state model and client sync. These are a great fit for turn-based strategy and persistent worlds. They are a poor fit for anything that needs 60 updates per second. Expect a niche, crypto-native audience and design for it.

Wallets players will tolerate

The wallet is where most blockchain games lose players. Asking a new player to install an extension, back up 12 words and buy a gas token before the tutorial is a churn machine.

What works:

1. Embedded wallets created at sign-up. Email, Google, Apple or Discord login creates a wallet in the background. The player can export it later. Our crypto wallet development guide compares embedded providers with building your own.
2. Gas sponsorship. The studio pays fees. When Immutable launched gas sponsorship for its zkEVM, it estimated developer costs of roughly $500 to $1,000 per 100,000 users. Check current pricing on your chain, but the order of magnitude is why sponsorship is standard now.
3. Session keys. The player approves a scoped key once (this game, these contracts, this spending cap, this time window), and in-game actions sign silently. This is where account abstraction with ERC-4337 and EIP-7702 pays off.
4. External wallets as an option, not a gate. Let crypto-native players connect their own wallet to bring or withdraw assets.

Choosing a chain

Players do not choose games by chain. You should choose the chain by what it gives you: wallet and marketplace tooling, gas sponsorship, a player base, and grants.

• Game-focused ecosystems such as Immutable and Ronin offer gamer wallets, marketplaces and publishing support. You trade some flexibility for distribution.
• General L2s such as Base and Arbitrum give you cheap transactions, mature EVM tooling and access to existing users and liquidity.
• Solana suits high transaction counts and has active consumer wallets, with a different programming model (Rust).
• Your own appchain or L3 gives you control over fees and throughput, plus another piece of infrastructure to run and bridges to secure. Bridges are a real risk: the 2022 Ronin bridge exploit drained over $600 million from the chain behind Axie Infinity.

We go deeper on this in which blockchain to build on.

Engines and SDKs

Nothing about blockchain changes your engine choice. Pick for the game.

Our strong preference: keep blockchain calls out of the game client as much as possible. The client talks to your backend; the backend talks to the chain, the indexer and the wallet provider. That keeps keys off the client, lets you change chains without shipping a new build, and makes console ports possible.

Store and platform policies

Distribution can kill a design before launch, so check this first.

• Steam lists, under content it does not allow, "applications built on blockchain technology that issue or allow exchange of cryptocurrencies or NFTs". If Steam is your main channel, either keep blockchain features out of the Steam build or pick another store.
• Apple updated its App Store rules in 2022 so that apps may sell NFT-related services through in-app purchase, but NFT ownership may not unlock features in the app. Read the current guidelines before you design any item that changes gameplay.
• Epic Games Store did not follow Steam's ban when it was introduced, according to PC Gamer's report at the time, but check current terms.
• Browser, PC launchers and Telegram are open, which is why many blockchain games ship there first. See our guide to Telegram Mini App development.

Economy design pitfalls

Axie Infinity is still the case study everyone should read. Its reward token, SLP, fell from a high of $0.40 to $0.004, and weekly players dropped from a peak of 2.7 million to around 368,000, according to Blockworks. The mechanics were predictable: rewards printed faster than anything removed them, and most players were there to extract income.

What we tell teams:

• Fun first, then ownership, then a token, if ever. If the game is not fun with fake money in a closed beta, real money will not fix it.
• Model sources and sinks before launch. Every currency needs places it enters (quests, drops) and leaves (crafting, repairs, fees). Simulate a season with bots and extractive players as well as average ones.
• Keep a soft currency off-chain. A non-tradeable in-game currency lets you tune the economy without a market reacting to every patch.
• Avoid marketing returns. Selling tokens or NFTs with promises of earnings can create securities exposure. In the EU, MiCA also covers public offers of crypto-assets, so get legal advice before any sale.
• Royalties are not guaranteed. Marketplaces may not enforce creator fees on-chain. Do not build your business model on them without a marketplace you control.

If you do plan a token, read our post on token economics that work before you write the whitepaper.

Realistic budgets

These are our planning estimates for the blockchain layer and the game around it. Game content (art, levels, audio) varies more than anything else, so treat the ranges as rough.

Two lines that get forgotten: external security reviews for every value-holding contract, and ongoing gas sponsorship and RPC costs once players arrive.

A build order that works

1. Prototype the core loop with no blockchain at all. Measure retention.
2. Decide what ownership adds, and write it down in one paragraph.
3. Pick architecture and chain, then design the contracts around the few things that must be on-chain.
4. Add embedded wallets and gas sponsorship. Test sign-up with people who have never used crypto.
5. Run a closed beta with real items but no token, and simulate the economy.
6. Get contracts reviewed, then launch the marketplace.
7. Consider a token only after the game has stable retention and a reason for the token to exist.

FAQ

How much does it cost to make a blockchain game?

Adding a blockchain layer to an existing game runs roughly $120k to $300k in our planning estimates. A new small game with on-chain items is closer to $600k to $2M, and most of that is the game itself.

What is the best blockchain for game development?

It depends on your players and tooling. Game-focused ecosystems like Immutable and Ronin offer wallets and marketplaces; general L2s and Solana offer cheap transactions and broader user bases. Pick for gas sponsorship, SDKs and distribution.

Can I make a blockchain game in Unity?

Yes. Unity has the most mature SDK support from game chains and wallet providers. We still recommend routing most chain calls through your backend rather than the game client.

Are blockchain games allowed on Steam?

Steam's onboarding rules prohibit applications built on blockchain that issue or allow exchange of cryptocurrencies or NFTs. Many teams ship a Steam build without those features, or distribute through other stores and the browser.

Do players need a crypto wallet to play?

They should not need to do anything. Embedded wallets created at login, with gas sponsored by the studio, let players start without knowing there is a wallet. Crypto-native players can connect their own.

What is a fully on-chain game?

A game where all state and rules live in smart contracts, so anyone can read the state or build their own client. Frameworks like Dojo on Starknet and MUD on EVM chains support this model.

Building a game with on-chain assets?

We design and build the blockchain layer for games: item and marketplace contracts, embedded wallets, gas sponsorship, indexers and economy modelling. Tell us about your game and we will tell you plainly what should be on-chain and what should not.