go to duelingnetwork.com it has a user limit so its hard to get on....but its free no download and you build your own deck...there are ranking systems or traditional where they wont rank u and u can use forbidden cards..if you donate to it, they will bypass your name to surpass the user limit
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you can play dos, ms-dos games online at: http://www.xtdos.com or http://www.oldmgamz.com
no
I believe it is impossible without a download.
you download them online and some u can play offline that u have downloaded
i would play the games