Daily Challenge Vault

Daily Challenge Vault is an update that was released for BTD5 on the 2nd of May, 2012. It allows

you to replay previously incomplete Daily Challenges for a lower reward (40%). If you play challenges from the vault, you will play them with rules of the actual patch (For example: If you play a challenge from Feb 7, 2012, You can't use towers or agents that were released before the date of the challenge.)

You can play daily challenges from 27th January - 29th February. When you complete an month of daily challenges, you'll get 40 Awesome Points.

Trivia

 * January has only five challenges so if you beat those it counts as one month.
 * One challenge gives you $8 Monkey Money if you beat it.