Yu-Gi-Oh! GX: Leaders Minimum System Requirements:
Requires a 64-bit processor and operating system
OS: Windows 7x64, Windows 8x64 (64-bit OS Required)
Processor: 2.5GHz CPU
Memory: 2 GB RAM
Graphics: 512MB DirectX 11.0 compatible video card
DirectX: Version 11
Storage: 2 GB available space
Sound Card: DirectX 11.0 compatible sound card

Yu-Gi-Oh! GX: Leaders Recommended System Requirements :
Requires a 64-bit processor and operating system
OS: Windows 8x64 (64-bit OS Required)
Processor: 3GHz CPU
Memory: 4 GB RAM
Graphics: 1GB DirectX 11.0 compatible video card
DirectX: Version 11
Network: Broadband Internet connection
Storage: 4 GB available space
Sound Card: DirectX 11.0 compatible sound card

Activation on Steam

1)      Download & install the Steam client on your computer from   here.

2)      Open the Steam client, register and login. Then, locate the Games tab on the top menu. Click that and select “Activate a Product on Steam..”

       

3)      Enter your code that is showed on the orders page of eTail. Market and and follow the steps showed to activate your game.

       

4)      The game can be monitored now and you can see it on the "Library" section on Steam. You can download and install the game now.

5)      If you need more information and support, you can click here: https://help.steampowered.com/en/wizard/HelpWithSteam