*Difficulty level　
Basically, the level of difficulty is for beginners to intermediate. If you find the puzzles too difficult, don't worry, there is a hint function!

*How to play　
Tap the screen to examine the item.
Tap an item twice to see the details of the item.
Tap the arrow at the bottom of the screen to change the viewpoint.
Tap the item you want to use, and then tap the location you want to use it.
Tap the gear icon in the lower left corner for volume setting and hints.
Saving is done automatically.