🧩 Level Information

• Level Number:155
• Question:Display 9 by turning the smartphone upside down
• Difficulty:Easy

🎯 Objective

Display '6' on the screen, then turn the smartphone upside down (invert it) so that it is recognized as '9'.

📝 Steps to Solve

1. Use the number keys or buttons on the screen to display the number '6'. If '6' is already displayed, just leave it as it is.
2. Refrain from searching for the '9' button and tapping it or swiping to change the number. Instead, take a moment to observe the entire screen.
3. Slowly lift the smartphone and rotate it 180 degrees so that it is upside down.
4. Keep the device upside down for a few seconds. The '6' on the screen will now be judged as '9', leading to stage clearance.

💡 Hints

• Are you only looking for buttons to change the number? Perhaps you could also use the area outside the screen (the smartphone itself).
• '6' and '9' are numbers that interchange when their orientation changes. Let's utilize this characteristic.
• There is no need to press a button to create '9'. Try changing the orientation of the current number. Turn the smartphone upside down.

🧠 Explanation & Key Points

This stage is a type of puzzle that breaks the stereotype of trying to solve it solely on the screen. Players might be inclined to think about 'in-app operations' such as pressing number buttons or swiping to change numbers, based on the instruction to 'display 9'. However, what is actually required is not to change the number itself but to change its orientation. The correct answer is to use the trick of turning '6' into '9' by inverting the smartphone to utilize the shape of the numbers. It is a common type of lateral thinking puzzle in Brain Test, where the key point is whether players can think of actions outside the screen like tilting, shaking, or rotating the device.

🔍 Common Mistakes

• Continuously tapping while searching for the '9' button. Progress cannot be made because the '9' button does not actually exist on the screen or it is unresponsive.
• Attempting to change '6' to '9' by swiping, but getting stuck as there is no change regardless of which direction you swipe in.
• Trying to drag the position of the number or overlap other objects to create the shape of '9', but the game does not provide that level of freedom and it does not result in a correct judgment.
• Avoiding tilting the smartphone due to worries about the screen rotation lock. In fact, it is unnecessary to rotate the screen system-wise; simply inverting the device is sufficient.

🎉 Advice After Clearing

After clearing this level, you'll get accustomed to the unique mindset of Brain Test, where not only the screen but also the movement of the smartphone itself becomes a part of the puzzle. In future stages, problems involving changing the 'orientation' or 'appearance' of numbers or shapes will arise, so you'll develop a habit of considering off-screen actions like tilting, shaking, or inverting the device as options.

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