Microsoft's Robbie Bach has revealed that "something like 70 or 80 per cent of the publishers in the world" are making games for Natal.
"[Nintendo makes] most of their money through first-party games that Nintendo produces. That's absolutely their business model. And it's a great business model, it's just different, but it makes it hard for third-party publishers."
Microsoft's first-party developers will make a "few titles" to "show the way", added Bach, who hopes to kick-start the "breath and power of the ecosystem from our partners".
But Nintendo will not be Microsoft's only concern, as Sony's PS3 motion-sensing wand enters the market this spring as well.