In this game, players draw lines that become walls to protect people and cities from various threats. The walls created by the player can be used to divert flowing liquid and stop it from causing damage. However, if the lines drawn by the player collide with each other, the game will end. With over 150 levels, players must be careful and strategic to successfully complete the game.

To save the city and its inhabitants, players must use their creativity and problem-solving skills to draw walls that can withstand the oncoming waves, magma, and enemies. The game offers a unique and challenging experience that requires players to think outside the box and come up with innovative solutions to protect their city.

It is important to note that EU and California users have the option to opt-out under GDPR and CCPA regulations. Players can respond to the pop-up displayed when starting the app or access the opt-out option within the app's settings. This ensures that users have control over their data and privacy while enjoying the game.