Design 2: Does haptic feedback improve performance regardless of difficulty level? Suppose that we use a two-way approach for the simulated game problem. There are two factors, joystick type and difficulty. Because joystick type has three levels and difficulty has four levels, this is a 3 × 4 design. This gives a total of 12 possible combinations of type and difficulty. With a total of 60 students, we could assign each combination of type and difficulty to five students. The time it takes to complete a navigation mission is the outcome variable.