The maintenance has ended. A new floor, Complete Annihilation Endless Corridors, has been added to the Special Dungeon, Endless Corridors. This new floor has also added to the 3-Player Multiplayer dungeon, Multiplayer! Endless Corridors, as well.
For more details, please see our original announcement: https://bit.ly/364uyHr
Thank you for your patience and for playing Puzzle & Dragons.