Every game is compatible with Windows, Linux, and macOS (though all of these games are 32-bit apps, which means they don’t work on macOS 10.15 Catalina). This is basically a two-month-long trial you won’t get to keep these games. For the next two months, each of the Half-Life games will be free to play on Steam. Half-Life: Alyx will launch in March 2020 for PC-based VR headsets, but right now, Valve is giving gamers the opportunity to catch up on (almost) everything Half-Life-related at no expense.
