1. Observe the appearance: Observe the appearance of the Altman blind box pen. The hidden Altman color is different from the ordinary Altman color.
2. Shake the box: When users buy the Ultraman blind box pen, they only need to shake the box. If there is no sound inside, it means that the toys inside are very big and will be hidden.
3. Listen to the sound: The balta star in Altman's blind box pen has a unique shape. If the user shakes loudly, it is not a hidden model.