Antitype comes from BorderLeap, LLC. The object is to figure out what the opposite words are and then tap on the correct sequence to get those words.
Look at image #1. We know the answer is That/This.
This is where it gets interesting: tap on any letter. That letter will not change. But its vertical & horizontal neighbors will become the next letter in the alphabet.
400 levels will keep you busy for a while! At the moment, I've done about 55 levels.