As an exercise on the road for preparation for the RMS (Running Memory Span) test.
The app only offers one speed. This is explicitly desired, since only the fastest speed is requested during the test. If you start to practice with a slower speed - it will result in a suboptimal "learning strategy" and outcome.
Display of the average correct entries after completion of the 25 test cycles.
With Family Sharing set up, up to six family members can use this app.