You can play up to a maximum of 4 players on little big planet.
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If it's the same console, then yes. If it's online or system link, then no.
No, Dead Island is only available for online multi-player via. Xbox live or Playstation network.
You need a HD "High Definition" TV.
Yes. There will be co-op in dead rising 2, but it is not certain if you can play on the same console.
Not on the same xbox/ps3 no unfortunately.