How do you get to the Mystery Lab?

A lot of people ask this question. Here it is how.

First of all: you have to play Tap Fish on iPod or iPhone.

Then, your game has to be updated. That means the app icon has to be like this:

and in your game, if you tap "about" you'll get this screen: 

notice the version number 1.62 Build 185

Then, if you meet all the above conditions, tap on menu, breed, mystery lab:

It is NOT working on iPad or Android!