Played similarly to other IQ Games, this Digits edition uses the numbers 0 – 9 as the shape pieces for the puzzles. Beginning with an empty tray, place the starting numbers from the featured puzzle as pictured. From there, fill in the remaining numbers until all can properly fit into the tray. There is only one solution for each challenge. Each game includes 1 travel case, 1 challenge booklet with 120 challenges in 5 different difficulty levels, and 10 circuit pieces. The instruction booklet fits inside the 5.4” x 5.4” travel case.