Perry Rhodan – Kampf um Terra is an innovative game combining the real time strategy and tower defense genre. Available for Android, iOS, Windows and Mac. Perry Rhodan is the name of a science fiction series published since 1961 in Germany, as well as the name of the main character. It is a space opera, dealing with several themes of science fiction. Having sold over one billion copies (in pulp booklet format) worldwide, it is the most successful science fiction book series ever written. The Perry Rhodan series has been translated into 14 languages.