Trivia Pass is a feature in which you can get incredible prizes by answering questions correctly in Classic Mode, Daily Challenge, Tower Duel and Events.
To access it, you must go to the main screen of the game and there press the "Trivia Pass" button, represented by a golden ticket.
As soon as you enter, you will see a board with different levels; within each level you will see the necessary amount of correct answers to advance to the next one. Next to each one of them you will see the prize that you will obtain in case you surpass it; the more levels you advance, the better rewards you will receive.
Once you reach level 29, you will have a chance to unlock a special chest.
In case you want to get better prizes, you can purchase the premium Trivia Pass, acquiring the VIP Membership.