To eventually earn his freedom, the Caretaker must trap as many children (referred to in the programme as "Unfortunates") as the Voice personally deems worthy.

Locked in a lift-like cage and winced up by The Caretaker via a simple wheel and pully system, the children begin at the top of the tower and must journey down to the bottom; one child is eliminated or "trapped" on each floor, and the last one remaining receives the "Key of Freedom" and escapes.

Each floor of the tower poses a different challenge to the team, demonstrated by Wiley while the Caretaker provides instructions through both live commentary and pre-recorded voiceover.

Before each challenge begins, one contestant is informed by The Voice, via their Whisper Clip that they have been chosen to act as a "Saboteur," and must try to make the team fail without being detected by the others.

Introducing a brand new attic for the Caretaker, recaps were made of previously trapped unfortunates on higher floors of the tower and the appearance of the Voice was revised.