level.Blocks.Add(new Block(216)
{
    PositionX = 30,
    PositionY = 30,
    Hsv = new Hsv()
    {
        Brightness = 0.5f,
        DeltaBrightness = true
    },
    AdditionalHsv = new Hsv()
    {
        Hue = 120,
        Saturation = 0.5f
    }
});

// Pay attention: block with id 1887 has only detail color, but hsv isn't additional
// AdditionalHsv used for detail color only when both color (base and detail) are present in the block
level.Blocks.Add(new Block(1887)
{
    PositionX = 60,
    PositionY = 30,
    Hsv = new Hsv()
    {
        Hue = 60
    }
});

level.Blocks.Add(new SfxTrigger()
{
    PositionX = 30,
    PositionY = 30,
    Pitch = 2,
    Speed = -3
});

level.AddColor(new Color(11)
{
    Rgb = RgbColor.FromHex("#ffa500") // orange
});

foreach (var color in level.Colors)
    Console.WriteLine(RgbColor.ToHex(color.Rgb));

public static class TestExtensions
{
    private static readonly ObjectSerializer serializer = new();

    public static Task<ServerResponse<T>> AsSuccessResponse<T>(this T value) where T : IGameObject
    {
        var data = serializer.Encode(value).ToString();
        return Task.FromResult(new ServerResponse<T>(HttpStatusCode.OK, data));
    }
}

public class Tests
{
    public void MyFavoriteTest()
    {
        var gameClient = A.Fake<IGameClient>();
        A.CallTo(() => gameClient.LoginAsync("test", "123")).Returns(new LoginResponse()
        {
            AccountId = 111,
            UserId = 333
        }.AsSuccessResponse());
    }
}