Instructions
Click on the "Home" button in the lower right corner of the screen. If you're already in your Moshi Monster's home, you don't need to do this.
Push the red button next to the door. This opens the puzzles menu.
Select "Daily Challenge." The game then presents you with a series of random questions, such as "What is the sum of 13 and 4?" Answer as many as you can in the time allotted. The more you answer correctly, their larger your Rox reward.