Head over to your local Home Depot and pick up the materials you'll need. They have everything in the store except for the X-Carve. For a proper Corn Hole game you need to make two boards.
Top: 2 x "2 ft x 4 ft x 1/2 in Sanded Plywood":http://www.homedepot.com/p/Sanded-Plywood-Common-1-2-in-x-2-ft-x-4-ft-Actual-0-451-in-x-23-75-in-x-47-75-in-1502104/202089006
Side of the frame You need: (4) 2 ft x4ft x 48 in
"Buy 2 pieces of 2 ft x 4ft x 96 in":http://www.homedepot.com/p/2-in-x-4-in-x-96-in-Premium-Kiln-Dried-Whitewood-Stud-161640/202091220 and have the person in the back cut them down into four pieces that are 48 in long each.
Front and back of the frame You need: (4) 2x4 x 21" for the frame "Buy 1 pieces of 2 ft x 4ft x 84 in":http://www.homedepot.com/p/2-in-x-4-in-x-84-in-Prime-Kiln-Dried-Whitewood-Stud-915319/202091234 and have the person in the back cut them down into four pieces that are 21 in long each.
Estimated time: 60 minutes