Social gaming outfit Zynga has announced the acquisition of four Solitaire card game mobile apps.

Buried deep in Zynga’s most recent Form 10-K filing with the Securities and Exchange Commission was the company’s casual announcement that it had bought some Solitaire mobile game apps from US developer Harpan LLC for around $42.5m in cash.

Zynga said it struck the deal with Harpan on February 14 but as the initial accounting for the “business combination” was incomplete, the company planned to record the preliminary purchase price allocation in Q1 2017.

The four games Zynga purchased are Solitaire, Pyramid Solitaire, FreeCell and Spider Solitaire, all of which are available for both iOS and Android devices. Harpan is owned by a pair of brothers, Tim and William Oswald, who can now presumably afford to play card games involving more than one person.