I just finish the Infinito Challenge for level 145. I just need to finish 5 more levels and I can get my free AR 36 Armonia weapon. I plan to do one Infinito Challenge once a week or on the weekends. However at the moment I'll take a break from anymore Infinito Challenges till next week.
Sirius: "Boring...What's the next challenge?"
Cadet Leonele: "Infinito Challenge all done by me. Pew Pew Pew"