A free program for Android, by Poppin Games Japan Co. Ltd..

Dr.STONE is a puzzle game where you’ll need to use the materials you gather to build a city and a kingdom. You can even go on adventures to find more materials! There are so many characters that you can create your own unique world with them, and the more you play, the more things you’ll be able to do! Some of them are basic, but you can get complex items if you keep playing. It’s all in the world of Dr. STONE. You can even go on adventures! There are so many different things to see and do in this world.