Although you can use the keyboard to move your character, this project is intended to be used with a Makey Makey, a handheld stamp, and contact pads. Keyboard: Player 1 uses the "A" and "D" keys alternately; Player 2 uses the Left arrow and right arrow keys alternately. Alternate key presses to move your character to the cookies. If using a MakeyMakey, move the contact pads to different heights on a wall, or a short distance from one another to require players to dash from point-to-point to move their characters. Makey Makey: Connect your stamps to "Earth" on the Makey, and then connect your contact pads to the arrows and letter contacts on the Makey. Plug your Makey into the USB port on your computer, and you're ready to play.
Complete build details can be found in the Instructable here: http://www.instructables.com/id/How-to-Build-the-Two-Player-Cookie-Dash-Game-With- Rationale for creating the game can be found here: http://www.shaun-taylor.com/christmas-games-with-scratch-and-a-makey-makey/