1) Set a 6-digit passcode.
2) Enter it again to feel the keypad.
3) Switch the keypad layout to Normal or Scrambled in the sidebar.
Use a touch screen or your mouse for the best feel (avoid typing numbers on your keyboard). Then try Time trial mode for a stronger comparison.
You’ll do 3 passcodes. For each one: Normal (timed) → Scrambled (timed).