Liam Charles and Tom Allen welcome the four remaining teams in this heat to face the challenges of chocolate week. The first round features a mystery assignment that will test the competitors' instincts and teamwork, while the second challenge is to construct a towering showpiece inspired by a famous skyline, incorporating geometric chocolate tarts and moving parts. Judges Benoit Blin and Cherish Finden are on hand to assess their efforts and decide who will be going through to the next phase of the contest.