In the finished Half-Life 2, there's a section where Gordon and Alyx are fighting through City 17 trying to reach Barney, and come to a destroyed bridge. You end up dropping down to the canal before a ...

Both cities are grim and overcast, and your route through each is dictated by the soldiers blocking off the streets. Both segments build to a violent climax, too, as Half-Life 2's opener ends with ...