2. Talk to the Wiseman. After you have completed the main storyline, talk to the Wiseman in the Wiseman's House in Asuka City. He will tell you about Highlight Heaven and give you the key to the door in the back of his house.
3. Enter Highlight Heaven. Go to the back of the Wiseman's House and use the key to open the door. You will then be able to enter Highlight Heaven.
4. Explore Highlight Heaven. Highlight Heaven is a large dungeon with many different floors. Each floor is filled with powerful Digimon, so be prepared for a challenge.
5. Defeat the final boss. At the end of Highlight Heaven, you will face off against the final boss, Belphemon. Defeat him to complete Highlight Heaven and obtain the game's best ending.