Some tend to concentrate on the appearance rather than how hard they are to open. 

 Mr. Iwahara tends to produce those puzzle boxes which are often mathematical and also which require many movements. 

     To reach the final drawer after moving 241 steps, you really need to concentrate on every step you are at. Otherwise you can get lost in the middle of nowhere, but after opening the last drawer you will be totally satisfied and you will realize that you had been somehow so relaxed during the process. 

 

 Each drawer is very small, although the puzzle box itself is relatively large. 

 This would be a perfect for those who want to get away from the stressful society and work for a moment while you are at home.

  I personally like to solve this puzzle making myself comfortable on a sofa with a glass of my favorite whiskey and concentrate on the puzzle to relax.