@pinksinftw: "Ludibrium Castle, commonly referred to as "Legoland", since the town is made out of Lego-type blocks, is a floating town that is supported by two monstrous 100 floor towers: Eos and Helios. It is suspended over Ludus Lake between two islands, where Omega Sector and Korean Folk Town are located. It is somewhat isolated from the rest of Ossyria island, though a trip underwater can get the player back. Ludibrium Castle is accessed via a train-like ship at Orbis. It is also accessible from Korean Folk Town via its link to Aqua Road. The monsters here are mostly toy-themed and time-themed. According to quests related to the Fourth job advancement, time has stopped in Ludibrium due to the crack in the dimension near the Time Sphere, which has allowed monsters like Alishar and Papulatus to sneak in to the Maple World."
Plus the clue is a dead give away "true kids in their hearts." kids love legos.