Due to debut with New Super Mario Bros Wii on November 25th in Europe, Demo Play, now called 'Super Guide', will allow players to let the computer take over play if a particular section proves too difficult for them. Until now this was all we knew about the feature, and many feared that this would be an example of dumbing-down the experience. Not so, as a matter of fact.
A Kotaku hands-on with the game provides more insight on the feature, which becomes available by way of a green block in a level after you've died Eight (!) times. After doing so, Mario changes into Luigi, who carries on through the level by himself, and you are able to resume control at any time with the press of a button; handy if there is a particular part of the level you can't beat. The completion of the level still counts if you use this feature, so lesser-skilled players can see more of the game instead of giving up early.
A couple of things to note about this feature, is that it is completely optional to use it, and if temptation proves to be too much, it should be changeable in the Option Menu. Also, the inclusion of this mode in NSMB Wii, and in future games, will allow Nintendo to significantly ramp up the difficulty level, as they will be doing here.
More details on the game itself have been unearthed from this hands-on time with it. There will be 8 worlds, with branching pathways much like the DS game. Mario will be the sole available character in Single Player, aside from temporary 'Super Guide' Luigi, and of course the plot involves him saving Princess Peach from the clutches of big bad Bowser.
Speaking of Mr Koopa, he, his son Bowser jr, and the grand return of the Koopa kids, will be your foes in this game, and there will be Toad-rescuing missions in already-cleared levels for extra replay value.
Multiplayer will of course have a co-op mode for the main story, but there are Free For All and Coin Battle competitive modes too. Free For All is a High Score battle, and Coin Battle is self-explanatory, featuring stages like a ghost house, and even World 1-2 from the original Mario Bros.
Would you like to see Super Play integrated into any other games that need a boost in difficulty level? Zelda Wii maybe?.