There are blocks of cloverleafs (three cloverleafs next to each other) within the world. The Karas have to find these blocks and replace the cloverleafs with their own.

Hint:
Because a Kara can not distinct between a green cloverleaf and a leaf of another Kara, it is possible that a Kara replaces the cloverleafs of another Kara with his own.