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The 3 most successful hardware add ons are Kinect, Wii Balance Board and the N64's RAM expansion pack.

Kinect because it has the most number of titles that support the add on: ~130 upcoming and existing games.

The Wii Balance Board because of the number of units sold: ~34 million units sold.

The RAM expansion pack because of the percentage of total system games that supported it: 15.5%...60 games out of 387 titles.

Significant support is subjective though.

The rEVOLution is not being televised