The deepness of sea is a place where you can have fun too. For example you can play with fishes in bubbles and click on them. Why? To gain points and have possibility to think.
Nothing must be switched or changed. It’s enough to search with your eyes for the same types of fish and click on them. The trick is, if you want to be the best, that you have to plan ahead. Cleaning the whole place is good bonus. However, the beginning is very slow and you often wait for new fishes.