The Pro Action Replay third-party cartridge for the Nintendo Game Boy is a game enhancer, created by Datel, which allows the user to enter special codes that modify the gameplay of any cartridge that is plugged into it. The pro version has a built-in ‘game trainer’ that allows the user to create their own codes.
![](https://bleepbloop.co.uk/wp-content/uploads/2023/05/gb-action-replay-Small.png)