Many players have not successfully achieved the Gluttony achievement of the Seventh Glitch of the Collapsed Star Railroad's Clever Bird. The key point of this level is to talk to the Clever Bird to answer the questions. You must be optimistic about every option. Please see the detailed explanation below for how to pass the level.
[ Location guide for the seven clever birds on the Collapsed Star Dome Railway ]
1. Arrive at the location shown in the picture and find the dissatisfied Clever Bird in the place where things are sold.
2. If you can ask two questions to the clever bird and finally reason out the answer, you will be considered a winner.
3. When asking questions, choose the same question twice to know the correct answer.
4. Then talk to the Clever Bird again. After the conversation is over, you can unlock the Clever Bird's seventh fault: Gluttony and some rewards.