The map's setting is a canal overpass and the park built above it in Berlin, Germany. The GSG-9 must protect a stalled military shipment on a canal overpass while the Phoenix Connexion can either attack the shipment head-on or attempt to destroy the overpass itself by bombing the pillar below.
The Counter-Terrorists spawn in bombsite A, where the disabled cargo truck is located at. Meanwhile, the Terrorists' Spawn Zone is around the bottom of the canal.
Bombsite B is located below the CT Spawn Zone and can easily be accessed from a stairwell. In here, snipers can easily guard here as a sniper nest is positioned towards the entire site.
"Fnatic boost"/Pixel Walking
Starting at Bomb site A, two players boost a third player near the barrier adjacent the crashed truck. The second player is actually standing on a mis-clipped ledge, making it appear as though the player is floating, known as "pixel walking". The boost allows the top player to see over the high barrier and through some invisible walls to preform recon or even attack Terrorist players advancing on Bomb site B, without putting the player in harm's way. Since the area is not reachable by normal means, it was deemed an exploit during the DreamHack Winter 2014 tournament and subsequently fixed as part of the December 4, 2014 patch.
The boost gets its name from a quarter final match during the DreamHack Winter 2014 tournament between Fnatic and Team LDLC.com. After the first two maps, LDLC and Fnatic were tied at one game a piece. At the half of the last map, Overpass, LDLC were leading 12-3. Fnatic switched to CT side and ended up winning the game using the boost. Afterwards, a formal protest was filed and submitted for review. Before the semi-final matches started, it was decided the match was to be replayed. Prior to the rematch, however, Fnatic resigned, giving LDLC the win. Team LDLC then went on to win the tournament.
The Tower visible in the map is the Nuremberg TV Tower located in Bavaria, and is not actually located in Berlin.
The skybox of this map is actually a picture of Prague instead of Berlin, as indicated by the Prague Castle being in the skybox.
The name of the park is "Parkanlage Schöneck" (Schöneck Park).
A graffiti located near the Mid Door contains the number 24724, the zip code of the rural community Freeman, West Virginia, a reference to Gordon Freeman, the protagonist of Valve's Half-Life series.
3 ATMs can be found near the CT spawn zone. If one shoots these ATMs sufficiently enough, the ATMs will break and will spew out dollar bundles.
The song "The Part Where He Kills You" from Portal 2 can be heard playing behind a pair of metal doors located at T Box.
The sound file can be found in /csgo/pak01_dir.vpk/sound/ambient/misc/techno_overpass.wav
Several map assets for Overpass were reused from Depot and Embassy, both of which are cut maps.
After the Fnatic boost incident, a new sign was added to A site advising against climbing over the barrier, referencing the incident.
A graffiti located at B site showing a CT defusing a C4 in a fire was added after an incident where professional gamer Olof "olofmeister" Kajbjer Gustafsson defused a bomb in B site in a fire in the Cologne 2014 Championship.
The park guide located at CT Spawn had not been updated to reflect the map's actual updates.
Added Cobblestone and Overpass maps, which are available to community servers and offline play. Official matchmaking is limited to Operation Bravo in order to collect additional map balancing data prior to a wider release.