かめ積み, developed by Yusaku OE, is a free game available on iPhone. This game takes you into a surreal world filled with adorable characters and addictive gameplay. The objective of the game is simple: stack as many "かめ" (turtles) as you can without letting them fall.

To play, you tap the screen to stack the turtles one on top of the other. If the stack collapses, it's game over. The challenge lies in how high you can stack the turtles and aiming for a high score. You can also find helpful items along the way to assist you in your stacking endeavors.

In addition to the stacking gameplay, there are also elements of turtle care. You can feed the turtles and help them grow. It's not just about eating though - the turtles also need exercise to stay in shape.

With its unexpectedly high difficulty level, かめ積み offers a unique and engaging gaming experience. But fear not, if you take good care of your turtles, you'll be able to overcome the challenges and become a "かめ王" (turtle stacking master)!