The Box

 is a quest in Build A Boat For Treasure. Players must transport a Mystery Block to the Treasure. The box seemingly has infinite or extremely high health, but can fly away. It does not need to land on the beach or touch the treasure. It needs to be near the end to win.

Phases
The Mystery Block has phases that could do anything to surrounding blocks, or players. It shows a specific color before doing anything. The Mystery block can do (List not in order) : Please note that the mystery block the player receives when completing the quest can do the same things, but only if it is clicked first.
 * Green: Give the player the zombie walk, and turns the avatar green with lower walk speed. (The player can infect people, but only if the mystery block is still there.)
 * Make a really big balloon that could carry the boat away if it is too light.
 * Yellow or Brown: Changes the blocks on the boat into Gold or Wood, beware.
 * Enlarge the player(s) head
 * White: Summon TNT to fall from the sky and demolish a piece of the boat.
 * Red: Sets the boat on fire.
 * Simulate a button press (activate balloons, thrusters, etc. near it)

Tips
Making a tough and durable boat would be enough, as long as it is in the middle with the mystery block. Make sure the blocks for the boat are heavy, so it will not fly away. To complete the quest faster, building a wheel, using a flying glitch, or making a small helicopter could do the job, after a few attempts. Another option is to connect the mystery block to multiple thrusters and control it (either with a pilot seat or sticking a chair to the player's head). Then simply activate the thrusters and fly over all the levels. As long as the player flies over the beach, it counts as a completed the quest. By placing a Pine Tree on top of the boat, the player can usually move the spawned TNT away.

The player can build a strong boat before activating the quest, then save the boat and clear all blocks. The player can activate the quest, load the boat and quickly launch.

Trivia

 * The quest used to give 250 Glass, 150 Gold, and 1 Mystery Block