The Brain Tumour Charity has been offering people the chance to play Mind Pong - a ping pong game controlled with the power of the mind.
The game was invented via a partnership between advertising powerhouse M&C Saatchi and the charity.
Using electroencephalography (EEG) technology to read brain waves via a Velcro headband, players can move a paddle on the screen up or down.
They concentrate to move it up and relax to move it down.
Ian McCafferty, from M&C Saatchi, said: "It's very much a 'seeing is believing' type of technology, people will be sceptical and be really intrigued as to what is going on. However, to actually do it - it moves when you expect it to move, you're completely bought into it."
Brain tumours kill more people under the age of 40 in the UK than any other cancer but they receive less than 2% of the overall spend on cancer research, the charity said.
The aim of Mind Pog is to raise awareness and funds for the charity.