Qui-Gon Joe wrote:I'm expecting something along the same lines as being able to watch a perfect playthrough in Ikaruga (there was that option on the disc, wasn't there?). If you want to do everything on your own, just don't watch it, I guess!
The Ikaruga playthroughs aren't quite the same as what's described in the 1up article. In Ikaruga, you could watch a playthrough through the options menu - not during the game, and only for those stages you have reached in-game. If you get stuck, you can study the playthrough to have a better idea of what to do next time you make it to a particular stage. This was also somewhat specific to Ikaruga, as the point of the game wasn't merely to finish it, but to master all of the patterns of absorbing and releasing bullets. You don't have to play the way the video shows you to win.
As described by 1up, New SMB Wii essentially features an "autopilot". Boss too tough for you to bother? Turn on demo play, then turn it back off after the game has defeated itself for you. The only caveat seems to be that the game then can't be saved, but what's the point of saving your progress if you're going to use this feature anyway?