You're looking for information on a license key for GameMaker Studio 8.1 Pro. Here's what I found:
GameMaker Studio is a popular game development engine that allows users to create 2D games. The 8.1 Pro version is an older version of the software, which was released in 2013.
ডাউনলোড করতে ডাউনলোড পিডিএফ এর উপর ক্লিক করুন