Halflife 2 is a classic first person shooter – witness the reviews on metacritic and gamerankings.com by way of example. Valve’s recent release of episode 2 for halflife 2 was only available as part of a bundle that also included the original halflife 2 and episode 1 expansion pak for it. This was kind of stupid for a lot of folks including me, since we already owned these, but Valve’s made it possible to ‘gift’ these licenses to someone else. So. If you want a free copy of halflife 2 and the first expansion pak, speak up in the comments. This is PC only. The hardware requirements are relatively modest since Halflife 2 is several years old now, though if you’ve got a recent machine it still looks great because they’ve been continually improving the engine.