Quest to the Castle is an minigame map for minecraft mcpe.
This is actually a board game for MCPE. You play with 1-4 players and roll the dice. Only one character can be chosen by each player.
Of course like any other board games there are rules needs to follow. To learn what the rules are you must watch the featured video.
The video will explain of how to play Quest to the Castle.
I can however tell you in how can you win the game. The first person to kill final boss is the winner!