Level walkthrough
Brain Test Level 321 Walkthrough: Swipe the Inspector's Hat to the Infrared Sensor

Brain Test Level 321 Walkthrough: Swipe the Inspector's Hat to the Infrared Sensor
Complete Walkthrough, Step-by-step Guide, Common Mistakes
🧩 Level Info
- Level Number:321
- Task:Swipe the inspector's hat to the infrared sensor
- Difficulty:Normal
🎯 Objective
Drag the hat worn by the inspector with your finger and swipe it to the infrared sensor located at the top (or nearby) of the gate to trigger a reaction.
📝 Step-by-Step Solution
- Find the 'Inspector' character on the screen. It's a person in uniform, wearing a hat on their head.
- Press and hold with one finger on the 'Hat' part of the inspector. Tap a spot where you can drag the hat itself, not the character's body.
- While holding the hat, drag it to the 'infrared sensor' device, which appears to be emitting light, located beside or above the gate.
- Move the hat in a light swipe motion, either horizontally or vertically, making sure it passes in front of or over the sensor.
- If the sensor reacts and causes a change in the gate or device, you clear the level. If it doesn't react, adjust the position of the sensor so that the tip of the hat fully crosses the sensor, and swipe again.
💡 Hints
- Try moving just the 'hat' instead of the entire person.
- Observe around the gate for any small devices or bars that resemble an 'infrared sensor' at the upper or edge of the screen.
- Not just bringing the hat to the sensor, since it says 'swipe', try moving it slightly across the sensor to trigger a reaction.
🧠 Explanation & Key Points
This task is a straightforward puzzle type where the text directly instructs you to 'swipe the inspector's hat to the infrared sensor'. The key point is noticing the UI quirk where you cannot move 'the whole person' but can drag 'only the hat'. Brain Test frequently uses mechanisms that allow only parts of characters (like hats, glasses, mustaches) to be draggable. In this level, you also need to have the idea to 'pass something through' the sensor—not merely placing the hat in front of the sensor but performing a 'swipe = passing through or caressing' action. Due to the stage setup, the sensor's position might be obscure, so be observant of the edges or upper part of the screen for lights or small devices, as they are crucial.
🔍 Common Mistakes
- Trying to drag the inspector himself directly in front of the sensor, resulting in being stuck since they won't move.
- Noticing the hat's presence but only tapping it instead of trying to drag, leading to misunderstanding that nothing is happening.
- Stopping after bringing the hat near the sensor without actually 'swiping (passing)' it, causing no reaction and mistakenly thinking it's a bug.
- Noticing the location of the infrared sensor and mistakenly swiping the hat on unrelated objects (doors, buttons, other people, etc.).
🎉 Advice After Clearing
When the inspector's hat passes the sensor and triggers the device, you clear the stage. This level is around the time where you get used to the Brain Test's unique trick of 'moving only small items like hats,' so continue playing with awareness of whether character parts can be moved individually will make it easier to solve the next challenging stages.