Vertical Okey is a mobile game developed by Temel Serdar for Android devices. It is a unique application that allows you to play Okey with one hand, making it more accessible and convenient for players. The game includes an in-app tutorial that guides new players on how to play Okey.

The app supports Google Play Games, allowing you to compete with your friends or other players online. You can play with 2, 3, or 4 players, and you have the option to play in teams. The game offers different ways to win, such as "Okey atma," "Çifte okey atma," "çifte giderek bitme," and "renge giderek bitme." It also has two end-of-game options and lets you choose between playing to 1, 11, or 21 points.

One of the best features of Vertical Okey is that it allows you to save your game progress and continue playing later. The app automatically saves your game when you receive a phone call, so you don't have to worry about losing your progress. Overall, Vertical Okey is an enjoyable game for Okey lovers who want to play with one hand.