The Thinker's Box is one of the many monster drops that can be acquired in the Frontier. Viable methods of acquiring the Thinker's Box include the following:
- A possible gift from the Otherworld Present.
- A possible reward from the Firefly Quest.
- A possible reward from a Treasure Chest.
- A possible reward from a Grand Treasure Chest.
- A possible item sold from Linkman the Junkman at a price of 175,000 gold.
- A possible reward from Stick for trading 10 or more fireflies.
- An 'uncommon' drop from the following mobs:
- A 'rare' drop from the following mobs:
In appearance, the Thinker's Box appears to be a cube that strikes a 'danger signal' to the players' conscious minds. Weird, unnatural-looking figures can be seen at the very top of the cube. Other than that, not much can be said about its overall appearance.
It is possible for players to exchange Thinker's Boxes for gold during Slayer's Tasks if the task card is currently active. Other than that, it can be sold to a selling vendor at a selling price of 25,000 gold.
- It may be a reference to Pandora's Box.