It is a complete remake of the 1998 Game Boy Color game, Dragon Quest Monsters: Terry's Wonderland.
The gameplay is reminiscent to Dragon Quest Monsters: Joker 2. The battle system, battle menu, and scouting system from Joker 2 is making a return in this remake of the first Dragon Quest Monsters game.
The game features include shifting from day to night, randomized dungeon layouts, combat with four opponents on each side, and a total of 609 monsters, including all the monsters from the original Game Boy Color release.The game also features an in-game Wi-Fi Store in the bazaar area. The Wi-Fi Store purchases can be made with the in-game currency, gold. The store's items changes daily, and the days Wi-Fi item store is only open after doing that day's Wi-Fi Ranking Battle. It can be used to buy monster eggs, (white, silver, and rainbow eggs) skill books, consumable items, and some weapons. Players have the ability to import monsters they have raised from Dragon Quest Monsters: Joker 2 and Dragon Quest Monsters: Joker 2 Professional (Rank A and higher only) through a free app upon completion of the game.
Source: Wikipedia, "Dragon Quest Monsters: Terry's Wonderland 3D", available under the CC-BY-SA License.