The Haloween towers appear every year at halloween. I just wanted to let you know that if you are challenging the easy tower you might want to be at least level five. If you are challenging the medium tower, level 10 and the hard tower level 15. I am a level ten about to be level 11 and I barely beat the first level of the hard tower. I died and my friend finished him off. I even had 1124 health! So if you are going to challenge a tower be prepared.