Excuse me but I appear to have a problem with the current challenge and it is not due to the inability of the API to register the challenge, rather it appears I am unable to receive the reward from the challenge and the report missing achievements is unable to cover situations such as these and so I humbly request that you check the system that you are using please and see if I may receive the reward and of course I will provide a screen shot proving my success if you allow me to have your email address or another way of showing you the screen shot. Thank you for reading.
Having a tower that has an upgrade that could disable special abilities would be nice but maybe it could have no damage of very little damage to balance it out.
 "Hands of War Tower Defense"){kind=icon}
 "Mystic Guardians"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Jelly Escape"){kind=icon}
 "Crystal Saga"){kind=icon}
 "Nightmare Runner"){kind=icon}
 "Fancy Pants Adventure: World 3"){kind=icon}
 "Greens Survive only when Reds Die"){kind=icon}
 "Freeway Fury 2"){kind=icon}
 "Focus"){kind=icon}
 "Flaming Zombooka 3 : Carnival"){kind=icon}
 "Get Off My Lawn"){kind=icon}
 "WarLight"){kind=icon}
 "Bible Fight"){kind=icon}
 "Trollface Launch"){kind=icon}
 "Toss the Turtle"){kind=icon}
 "Flight"){kind=icon}
 "MARDEK RPG: Chapter 1"){kind=icon}
 "Cursed Treasure: Don't Touch My Gems!"){kind=icon}