Read the following screens carefully. These give all the information you need to answer the questions correctly.
You can then choose which country you would like to visit: Ethiopia, Ghana or Nepal. When you are at the village you will be given a series of choices to help the villagers solve their water supply problems.
If you make the right choice you move on to the next screen. If you are wrong you lose a bucket and will need to choose again. To complete the game you need to get to the final screen with at least one bucket. The aim is to complete the game losing the least number of buckets.
Pani the Hand Pump will give you advice when you click on his icon in the bottom right corner but be careful as you can only ask him twice.