The year was 2005 and I was playing Codename: Gordon, a 2D sidescroller set in the Half-Life lore, using Macromedia Flash Player run via Wine on Linux.

Apparently this game can still be installed by any Steam user with the command steam steam://install/92 because it was part of the freebie package “0”.

…and no single Proton was in sight 😛

Ymmv.