Solana Unity SDK: the C# client for game devs, with real wallet integration

using Solana.Unity.Rpc;
using Solana.Unity.Rpc.Types;
using Solana.Unity.Wallet;
using Solana.Unity.Programs;

// RPC client (mainnet / devnet / custom URL)
IRpcClient rpc = ClientFactory.GetClient(Cluster.MainNet);

// Wallet from seed (testing) or via wallet adapter (production)
Wallet wallet = new Wallet("...your 12/24-word mnemonic...");

// Build + send a transfer
var blockHash = await rpc.GetLatestBlockHashAsync();
var tx = new TransactionBuilder()
    .SetRecentBlockHash(blockHash.Result.Value.Blockhash)
    .SetFeePayer(wallet.Account)
    .AddInstruction(SystemProgram.Transfer(
        wallet.Account.PublicKey,
        recipientPubKey,
        100_000_000ul))   // 0.1 SOL in lamports
    .Build(wallet.Account);

var sig = await rpc.SendTransactionAsync(tx);
Debug.Log($"https://solscan.io/tx/{sig.Result}");

using Solana.Unity.SDK;

// Singleton — manages connect/disconnect across the whole game
public class WalletConnectButton : MonoBehaviour
{
    public async void Connect()
    {
        // Auto-picks the right backend: Phantom deeplink on mobile,
        // browser bridge on WebGL, in-game embedded option, etc.
        var account = await Web3.Instance.LoginInGameWallet("optional-password");
        Debug.Log($"connected as {account.PublicKey}");
    }

    public async void SendInGamePurchase()
    {
        var tx = /* build your transaction as above */;
        var sig = await Web3.Wallet.SignAndSendTransaction(tx);
        Debug.Log($"purchase complete: {sig.Result}");
    }
}

using Solana.Unity.Programs;
using Solana.Unity.Wallet.Utilities;

// Mint a token to a player's ATA
var mint = new PublicKey("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v");
var playerAta = AssociatedTokenAccountProgram
    .DeriveAssociatedTokenAccount(playerPubKey, mint);

var tx = new TransactionBuilder()
    .SetRecentBlockHash(blockHash)
    .SetFeePayer(serverWallet)
    .AddInstruction(TokenProgram.MintTo(
        mint,
        playerAta,
        100_000_000ul,        // amount
        mintAuthority))
    .Build(mintAuthority);

await rpc.SendTransactionAsync(tx);

// Fetch and deserialize a custom account
var info = await rpc.GetAccountInfoAsync(playerStatePda, Commitment.Confirmed);
if (info.Result?.Value != null)
{
    var bytes = Convert.FromBase64String(info.Result.Value.Data[0]);
    // Parse with Borsh or your custom deserializer
    var playerState = BorshDeserializer.Deserialize<PlayerState>(bytes);
    Debug.Log($"player level: {playerState.Level}, gold: {playerState.Gold}");
}