In a trading update, HMV Group said its move to "increase the mix of games and technology" it stocked had led to a 4.3% year-on-year increase in sales at the music retailer in the four months to the end of August.
The group confirmed that work was underway to roll out a points-based loyalty card scheme by the end of the year.
It follows a similar scheme at HMV Group's book retailer, Waterstone's, which "continues to grow strongly", with 1.8m members.
HMV's sales growth was not matched at Waterstone's, however, which saw a 1.7% fall in like-for-like sales, excluding the impact of the new JK Rowling novel, 'Harry Potter and the Deathly Hallows', last July.
Simon Fox, group chief executive, said: "As we approach the peak selling period, our focus is on continuing to provide our customers with the very best offers, from what is shaping up to be a strong line-up across all product categories for Christmas."
The company is due to announce its half-year results, covering the six months to the end of October, on December 11.