Steam now offers a playable demo for Football Manager 2015, offering the chance to kick around a sample of this association football/soccer sequel (thanks Frans). The game is available for Windows, OS X, and Linux, but the "PC Demo" apparently only covers Windows. The quesswork is due to lack of specifics about the demo, so here's an overview of the game itself:

Football Manager is the most realistic, in-depth and immersive simulation of football management available, putting you in the hot-seat of almost any club in more than 50 countries across the world, including all of Europe’s biggest leagues.

Football Manager 2015 will allow you to live the life of a real football manager – you decide who plays and who sits on the bench, you're in total control of tactics, team-talks, substitutions and pitch-side instructions as you follow the match live with the acclaimed 3D match engine.