How do you get into the disco secret door in moshi monster.?

To get into the disco secret door in Moshi Monsters, you must first complete a series of quests. Here are the steps to do so:

1. Talk to Katsuma: Speak to Katsuma, who is located in the Music Store in the downtown area of Monstro City. He will provide you with the first quest.

2. Play the piano: Complete the piano quest by playing the correct notes on the piano. The notes are given to you by Katsuma.

3. Retrieve the disco ticket: Receive a disco ticket as a reward for completing the piano quest.

4. Give the ticket to Rox: Head over to Rox's Music Emporium and speak with Rox. Give the disco ticket to him.

5. Defeat Kooky Cooky: Rox will challenge you to a dance battle against Kooky Cooky. Defeat Kooky Cooky by performing the correct dance moves according to the instructions on the screen.

6. Enter the disco: Once you defeat Kooky Cooky, Rox will open the secret door to the disco for you.

Now you can access the disco and enjoy dancing and mingling with other Moshi Monsters.