Arriving with two pedometers (one white, one black), Walk With Me! isn't really a game so much as a tool designed to work alongside Wii Fit to make players more aware of their health and daily routine.
Intended for daily use, players carry around a pedometer in their bag or pocket and feed the data into their DS at the end of the day, with the device recording the number of steps taken, marking periods of activity, before representing the stats - in a typically Nintendo manner - as a kind of animal. Are you an evening owl or a daytime sheep? You can find out here, and even import or create a Mii to represent you.
That accomplished, you can then play some mini-games using your stats - Walk The World creates pictures (based on landmarks, objects or unusual creatures) from the player's steps, while you can illuminate a street with the power generated from your activity - if the second pedometer has been active during the same time as your own (for example, on a walk with a spouse or family member) then the two synchronise to provide a power boost. You can also compare rankings with other players via Nintendo's Wi-Fi Connection.