Any type except for Unknown (???). Total duration must be 15 or more minutes. Unknown (???) is TV type only.
MAL must say the series was broadcasted on that day of the week. For movies, OVAs, etc. you can find what day the anime aired by using your computer's calendar (if this confuses you, then don't use).
For Unknown (???), MAL must actually say "Unknown" - it cannot be just an aired year as this will not count.
Challenges can be completed a total of 3 times each. Must finish previous challenge before starting the next (aka you can't be working on two Monday challenges. One must be completed first before you start the second).