Do I need to do the 100% hive stuff every day for the whole month of January totalling up to 31 blogs or 31 days?
Yes. Either a post with 100% power up or a "classic" power-up of at least 1 HIVE
if I miss 1 day, I am not valid for the PUM for January?
Yes. This challenge is merciless
Am I allowed to make other blogs with 50/50 rewards?
Yes