The plot of Episode One pulls Alyx and Gordon out of the epicenter of the explosion that rocked the HL2 finale and quickly, not giving them time to recover, throws the pair into a new five-part predicament. Fortunately for Freeman, as with the rest of humanity's on-staff specialists, enemies are always plentiful. Want to head into the God-knows-who-occupied City 17? Then hurry to buy Half-Life 2: Episode One. Incredible, vivid impressions await you!
All the game ideas are logically developed. There are more puzzles now, which can be solved with the help of the "gravity gun". By the way, they've become noticeably more sophisticated, so they'll challenge both ours (the smart ones) and yours (the dumb ones). You'll have to use this marvel of engineering thinking later on as well, since in the city's entertainments it's very, very hard to do without ammo for the guns you already have. But enough chatter! Dive into the events and start acting, because the local zombies are already rubbing their hands, hoping to take a bite out of you.