A tall and shorter human figures walk through the gigantic storage house, to find a car behind the wall in a white room.

Mystery Object Challenge

Come and test your detective skills by guessing the identity and purpose of quirky, historical objects.

The Mystery Object Challenge is a free, family-friendly activity where participants learn about one of more than half a million objects held in the Powerhouse Collection.

Drop-in at either 11.30am or 2.30pm every Saturday and Sunday to join the challenge.

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Ended 29 Jun 2025

11.30am or 2.30pm until 29 June

Free

FreeGeneral

Castle Hill

On Dharug Land

Powerhouse Castle Hill

2 Green Rd, Castle Hill NSW 2154

Plan your visit

Accessibility at Powerhouse Castle Hill

Getting to Powerhouse Castle Hill

Country Always

Country Always

Caring for Country

A Corner of the Empire

A Corner of the Empire

The Garden Palace

The Holding Pen

The Holding Pen

The Agricultural Hall

Regional Networks

Regional Networks

Across New South Wales

A Museum of Doing

A Museum of Doing

Technological Museum

Expanding Stories

Expanding Stories

Evolution of the Castle Hill site from botanical research station to Museum Discovery Centre

Transforming the Tramsheds

Transforming the Tramsheds

Powerhouse Stage 1 and the Harwood Building

A Symbol in Time

A Symbol in Time

Sydney Observatory

Ongoing Transformations

Ongoing Transformations

Powerhouse Ultimo

Applied Arts and Sciences

Applied Arts and Sciences

Defining the terms in the 21st century

Mystery Object Challenge

Powerhouse Renewal

Powerhouse Renewal

A transformative renewal program across four sites

We Rise

We Rise

Blak Powerhouse

Powerhouse-1 Mission Launch to the ISS

Powerhouse-1 Mission Launch to the ISS

An initiative of the Powerhouse: Future Space program

2024

2024

Exoskeleton

Exoskeleton

Powerhouse Parramatta

Parramatta

Parramatta

2024

Mystery Object Challenge | Powerhouse