Currently on the Steam client I have installed on my laptop that runs Mint, I can install roughly 20 games from my existing Steam library. Some of these games

Currently on the Steam client I have installed on my laptop that runs Mint, I can install roughly 20 games from my existing Steam library. Some of these games were available the moment I installed the client, others gained working Linux ports and became available in the Linux client with no action on my part. Beside the Call of Duty port for Mac mentioned below, I know of no other game that has required multiple purchases for multiple platforms.