Boxville

I found this text guide by The Walkthrough King to be 100% accurate

https://www.walkthroughking.com/text/boxville.aspx

The only part that may keep you busy is when you reach the shop at the lower level and are trying to answer 9 questions correctly in row to retrieve the yellow ball needed for the final achievement as the questions are all random! They start out easy and getting progressively harder but they shouldn't cause too much trouble..... basically a character is shown on the left and they travel through a box to the right and this box changes something about their appearance. These seem to be a change of Glasses/Hat/Size/Holding an Object. Simply choose the correct option at the bottom from 4 choices to progress to the next question. As the questions get harder the character is joined by a 2nd character and they travel through more boxes so it's a simple case of looking at each of the 4 options and ruling each one out as you inspect what each box changes about them