As pointed out by PC Gamer, the information was revealed - supposedly by accident - in a trial exhibit during the ongoing legal battle.
In the document, uploaded to the the Resetera forum, shows that Epic Games offered Sony a minimum revenue guarantee of $200 million for between four and six exclusive first-party PlayStation titles. It's unclear if this figure means per game, or in total.
Given that Horizon Zero Dawn released on Steam in August of last year, it appears that Sony declined Epic's offer. Days Gone, developed by the first-party Bend Studio, will also release on Steam on May 19.
The ongoing case has highlighted the lengths that Epic have gone to establish its storefront in the market, with documents and testimony revealing that Epic had earmarked around $1 billion in advances by September 2019.
The documents surrounding the Sony offer also reveal that Epic had tried to secure titles from both Microsoft and Nintendo, with the latter being described as a 'non-starter' and the former viewing Epic as 'competition'.
The trial continues.