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The objective of this game is to teach and promote science. That's why I felt it was right for it to be free. However, if you really enjoyed it and would like to help me finance future games, you can purchase this DLC as a show of support.

In return, you'll receive a small cellphone wallpaper as a token of my appreciation. You can find it in the game's installation folder.

Thank you for trying out my game and visiting this DLC page.

Let science continue!