> **Experimental**
>
> `@aws-cdk/aws-gamelift-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# GameProperty

A set of custom properties for a game session, formatted as key-value pairs.

These properties are passed to a game server process with a request to start a new game session.

This parameter is not used for Standalone FlexMatch mode.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/matchmaking-configuration.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0-alpha.0/packages/@aws-cdk/aws-gamelift-alpha/lib/matchmaking-configuration.ts#L15)

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as gamelift_alpha from '@aws-cdk/aws-gamelift-alpha';
const gameProperty: gamelift_alpha.GameProperty = {
  key: 'key',
  value: 'value',
};
```

## Properties

- `key`: string (required) — The game property identifier.

- `value`: string (required) — The game property value.