Inside the tunnel beyond ... a path for you into the Combine Citadel. If you were looking forward to a Xen-like set of jumping puzzles at the end of Half-Life 2 (and we know you all were), you ...

Grab the gravity gun from Dog and then wait for Alyx to leap to the upper level. To follow her, use the gravity gun to rip down the boards that are holding up a metal ramp that leads to the ledge.

and it has radically altered my perception of the original FPS Half-Life 2's 2003 beta reveals the mystery behind a City 17 river that once led players to the foot of the Citadel Gaming Industry ...

Players of Half-Life 2 will recall the fact that you won your battle with Dr. Breen’s forces atop the Combine Citadel in the heart ... don’t waste any time getting inside!