The Xbox Live Arcade is the name of a group of games released by Microsoft over the Xbox Live Network. One can download the games by paying so called Microsoft Points, the virtual value of the Xbox Live Network. The games will then be downloaded to the hard drive or the memory unit of the Xbox 360 console.
Banjo-Kazooie and Banjo-Tooie are both available for download over the Xbox Live Network, costing 1200 Points each, and L.O.G.'s Lost Challenges is available as a DLC for Banjo-Kazooie: Nuts & Bolts for 400 Points.