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• Mental Math Practice33 timed drills with typed answers, scored in correct answers per minute.
• Mental Math TestA timed mixed test of all four operations by level, scored in correct answers a minute.
• 40 Hz Test Tone for Subwoofers and Rattle HuntingPress Play for a steady 40 Hz sine wave, or Save WAV to download a 60-second file for the car.
• Beige ScreenTap the beige to fill your screen with it, or pick wheat or bisque first.
• Black ScreenPress Go full screen to fill your whole screen with pure black, #000000.
• Blue Screen TestPress Go full screen and the display turns pure blue, ready for a pixel or night-mode check.