Sales of digital points cards in stores rose slightly from 158m in 2014 to 160m last year.
The main area of growth in this sector are cards bought for specific individual titles, which was valued at 27m in 2015.
IHS estimates that over 1.224bn was spent on PC and console digital games in 2015 - including microtransactions and DLC. That means digital points cards accounted for around 13 per cent of the overall digital games market.
Digital points card figures are courtesy of GfK Entertainment.