Half-Life 2: Episode One

Just like the mysterious G-man, Valve has kept us wondering about the meaning of the many clues in the second chapter of Half-Life. For fans of the franchise, searching for answers is part of the fun. It looks like the Combine is keeping a tight lid on elements like new weapons, new enemies and fresh environments; not to mention any of the physical puzzles you'll face that helped define Half-Life 2 's show-don't tell approach to gameplay. But the simple promise of improved graphics, more Alyx and more Dog has us sold. The waiting is the hardest part.