After the Kalypso Store-only sales that I had posted earlier, today Kalypso Media went ahead and made a sales page directly on Steam, as they continue to celebrate their 15th anniversary as a games publisher - starting today, Friday (2021-09-03 03:00am) until next Thursday (2021-09-09 03:00am).
At a brief glance, the featured/discounted games titles are similar to what I saw listed on the Kalypso Store's sales webpage, but this newly announced Steam storefront sale has a more extensive range of discounted games, e.g. not just Sudden Strike 4, but the earlier Sudden Strike 1, 2, 3 and expansions as well, and a whole bunch of other published titles with their expansions/DLCs.
Which ones are 80% off?