Is there any video game software you can buy and create your own video game?

For about six months i've been trying to find software so I can try to create my own games so I can get a little practice for when i start doing computer science. Is there a good piece of video game software u can either buy or download on computer or laptop and you can actually create full length video games? And if there is, what is the name of it and what does it do?



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