Filter drinking water

Observe the pollution value of the contaminated water pipe, click the sponge with a number, and filter the polluted water into drinkable water by calculation.

This is a game that trains the player's computing power. Players need to carefully observe the polluted water pipes. After learning the pollution value of the water pipes, you need to filter the water pollution value to 0 by calculation. Tap the sponges on both sides to let the filter sponge filter the water droplets. Before the water drops fall into the cup, the water drops need to be filtered to the extent that they can be drunk directly, that is 0. In "difficult" mode, players need to filter two pipes at the same time. You can unlock more cups through constant challenges.