A free program for Android, by Tapps Games.

Kangaroo Evolution is a free, funny and addictive incremental game with many challenges and many stages to explore. The more stages you pass, the more challenges you’ll encounter. In the first few stages, you will only need to tap and drag to create new mutant creatures. As you progress, you’ll be able to combine the creatures and create new ones. Some stages require more attention to detail.

The challenges in this game include:

The game contains many different species of kangaroos. Each kangaroo has its own unique abilities and characteristics. The more kangaroos you create, the more difficult and exciting the game will be. You’ll need to pay attention to the number of kangaroos you’re creating.