Dr Doug Brown of the Alzheimer's Society said: "Online brain training is rapidly growing into a multi-million pound industry and studies like this are vital to help us understand what these games can and cannot do.
"While this study wasn't long enough to test whether the brain training package can prevent cognitive decline or dementia, we're excited to see that it can have a positive impact on how well older people perform essential everyday tasks."
The odd flower out in the photo is the green circular one.