01
Unknown Gravity: the blockchain layer of your game
Unknown Gravity is a technology company based in Málaga, Spain, and the publisher of this page. It does not build the game itself: according to its Web3 game development guide, it builds the blockchain layer (contracts for items with ERC-721 or ERC-1155 and for the currency with ERC-20), the player account layer and the indexer, and integrates with whatever engine the studio already uses. It also builds NFT marketplaces and performs smart contract audits scoped to a specific version of the code.
- Where it operates: from Málaga, Spain.
- Registration: Unknown Gravity, S.L., Commercial Register of Málaga, sheet MA-177027; its incorporation was published in the BORME of October 18, 2023.
Where it fits: you already have a studio and an engine and need the contracts, the player wallets and the connection to the chain. Where it does not: you are looking for someone to design and code the whole game.
02
LimeChain: VCOIN, the token of the IMVU virtual economy
LimeChain presents itself as a blockchain consulting and development company; it is not a game studio. According to its website, it builds smart contracts, wallets and full products, and works on asset tokenization.
- Where it operates: from Sofia, Bulgaria.
- Registration checked: Lime Labs EOOD, on the Bulgarian Commercial Register under EIK number 204318511, with its registered office in Sofia.
- Virtual world project: according to the IMVU case study on its website, IMVU is a social network of 3D avatars with a catalog of user-created virtual items, and LimeChain created VCOIN for it, an ERC-20 token on Ethereum. The goal, the case study says, was that the value users held on the platform, until then in virtual credits they could not take out of it, could also be used outside it.
Where it fits: your game or virtual world needs a currency in the form of a token and a team with tokenization experience.
Who does what in a blockchain game
Before comparing companies, separate the pieces. Some companies cover several, but the contract should say who is responsible for each one:
| Piece | Who builds it | What to ask for |
|---|
| The game: design, engine, server and art | Game studio | Published games and an in-house team |
| Item (NFT) and currency contracts | Blockchain development provider | Contracts in production, verified on the network's block explorer, and an independent audit |
| Player account and wallet | Blockchain provider, with the studio | Sign-in without installing anything and a plan to recover the account |
| Indexer and backend | Blockchain provider or studio | The game reads asset state without waiting for the chain |
| Marketplace | Blockchain provider | Fees, royalties and integrated payment methods |
| The network (layer 2 or gaming chain) | A third party: not hired as development | Cost per transaction, latency and ecosystem |
That is why this guide does not list gaming networks or platforms: they are the infrastructure you build on, not companies that build your game. The full architecture and where the budget goes are in Web3 game development.
What to ask before you hire
- Assets in production. Ask for item or currency contracts already used by real players, verified on the network's block explorer.
- An audit. Ask for an independent audit of the contracts and the marketplace (see smart contract audits).
- What happens if the studio shuts down. Where the NFT metadata is stored (on-chain or off-chain) and who controls the contracts and their keys.
- Design decisions with their reasons: the game economy (more in tokenomics), the player account and the chosen network. The criteria for each are in Web3 game development.
NFTs, in-game currencies and MiCA
In the European Union, the MiCA Regulation (Regulation (EU) 2023/1114) treats unique items and the in-game currency differently:
- Unique items. MiCA does not apply to crypto-assets that are unique and not fungible with other crypto-assets (Article 2(3)), such as digital art and collectibles (recital 10).
- Not every NFT is unique. Under recital 11, fractional parts of a unique crypto-asset are not unique, issuing it in a large series or collection is an indicator of fungibility, and a unique identifier is not enough on its own: substance counts, not form.
- The in-game currency (for example, an ERC-20 token) is a fungible crypto-asset. Title II of MiCA, which governs its offer to the public, does not apply, among other cases, if it is offered for free, if it is a utility token giving access to a good or service that exists or is in operation, or if it can only be used in exchange for goods and services in a limited network of merchants with contractual arrangements with the offeror (Article 4(3)). It does not count as free if players must provide personal data in exchange or if the offeror receives fees or other benefits for it. And in the limited network case, if the consideration exceeds EUR 1 million over 12 months, the offeror must notify the competent authority. None of these exemptions applies if the offeror announces, in any communication, its intention to seek admission to trading of the token (Article 4(4)).
How your item or currency is classified depends on its actual features. Run a first check in the MiCA/MiFID classifier and confirm it with your legal counsel before launch.
Frequently asked questions
Which companies build blockchain games?
There are two types: game studios that add a blockchain layer to their games, and blockchain development companies that build that layer for a studio. In this guide we only list companies whose business registration and named client project we could check, which is why the list is short.
How much does it cost to build a blockchain game?
There is no single figure. Ask for a quote broken down by piece (game, contracts, player account, indexer and marketplace), with the audit included.
Are in-game NFTs regulated by MiCA?
Truly unique, non-fungible ones fall outside it (Article 2(3) of MiCA). Those issued in large series, fractionalized or that work as interchangeable may fall within it, under recital 11.
Why does Unknown Gravity appear first?
Because it publishes this page. The numbering is not a quality ranking, and none of the other companies paid to appear or reviewed its entry.
Sources
Data verified as of October 14, 2026. This guide is not legal advice. It is published by Unknown Gravity, which is one of the providers listed. Talk to us.