The official Super Smash Bros. Brawl website has trumpeted that Super Smash Bros. Brawl will come with its own Stage Builder.
It all looks very simple and easy to use, too, with big and clear instructions as well as lots of opportunities to try out your half-finished creations.
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Once you are happy with it you can pop online and send it through to Nintendo, who will send out a new user-created map to all the Smash Bros. owners around the world every day.
Once you have spent an evening punching Mario in his hairy face on the unique creation it will disappear, as the idea is to have a new flavour every day - "a once-in-a-lifetime encounter".
Pop over to the official website for some pictures of the Stage Builder in action.
Super Smash Bros. Brawl is a beat-'em-up featuring characters like Solid Snake, Kid Icarus, Sonic the Hedgehog, Peach, Fox McCloud, Samus, Pikachu and co.