You can do this in 2 ways, you can download the offline version of scratch from their official website. We are using the latest version of scratch which is scratch 3. You can do this even in older versions. Scratch 3 is available for both windows and mac. Both the older versions (1 & 2) is available in Linux also. I am a Linux user and I want the latest version of scratch I am using their website to make this game. Yes you can make a game just using your browser. Isn't it fascinating. This is the link to there website :-