Solid Alert is a free Android app developed by Pedro Soares. As the name suggests, it plays the iconic alert sound from the Metal Gear Solid video game series. The app is straightforward and easy to use, making it a must-have for any MGS fan.

Upon opening the app, you are greeted with a large red button labeled "Alert." Tapping on the button will play the alert sound. There are no additional features or settings to configure, making the app very simple and to-the-point.

Overall, Solid Alert is a fun app that serves a single purpose - playing the Metal Gear Solid alert sound. While it may not have any additional features, it does what it sets out to do flawlessly. If you're a fan of the series, this app is a must-have for your collection.