playr.org or gbemul.com
playr.org
Pokemonindigo
playr.com
Nup
There's no way of playing it without downloading... Its a hacked version, so it must be downloaded....
http://snesbox.com/ you can also play Nes games on there too.
8-| Try online Flash games.
funorb.com + miniclip.com
You could try Yahoo games
through the internet
In acid play
You can't. You can play other games like it. But not minecraft.