You can play the free version on minecraft's home page. The link is under "Sources and related links" below this answer. Mind that the free version is Classic, not Survival, meaning that there are infinite blocks to play in, just free building.
Or the multiplayer version. Mind that you need an account, which is achieved through registration.
You can also play the Survival version. Mind that you need to buy the game, which is achieved through an account, which is achieved through registration.
Minecraft Beta currently costs 14.95 Euro, which is about $20 USD.
go to the website and download it or play off of browers
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there is no way to play minecraft as a guest.
you can play minecraft pocket eddition on it
no you can not
play minecraft a lot.
There are no age restrictions on Minecraft so technically yes you can play Minecraft age 9.