Edit, ok got it slightly wrong, heres what wiki says:
The game is played from the perspective of a character named Artyom. The story takes place in
post-apocalyptic Moscow, mostly inside the
metro system where the player's character was raised (he was born before the war, in an unharmed city), but occasionally the player has to go above ground on certain missions and scavenge for valuables.
The games' locations reflect the dark atmosphere of real metro tunnels, albeit in a much sinister and bizarre fashion. Strange phenomena and noises are frequent, and mostly the player has to rely only on their flashlight to find their way around in otherwise total darkness. Even more lethal is the surface, as it is severely irradiated and a gas mask must be worn at all time due to the toxic air.
[7] Water can often be contaminated as well, and short contacts can damage the player, or even kill outright.
Often, locations have an intricate layout, and the game lacks any form of map, leaving the player to try and find its objectives only through a compass - weapons cannot be used while visualizing it. The game also lacks a health meter, relying on audible heart rate and blood spatters on the screen to show the player what state they are in and how much damage was done. There is no on-screen indicator to tell how long the player has until the gas mask's filters begin to fail, save for a wristwatch that is divided into three zones, signaling how much the filter can endure, so players must continue to check it every time they wish to know how long they have until their oxygen runs out, requiring the player to replace the filter (found throughout the game). The gas mask also indicates damage in the form of visible cracks, warning the player a new mask is needed. The game does feature traditional
HUD elements, however, such as an ammunition indicator and a list of how many gas mask filters and adrenaline shots (med kits) remain.
Another important factor is ammunition management. As money lost its value in the game's setting, cartridges are used as currency. There are two kinds of bullets that can be found, those of poor quality made by the metro-dwellers themselves, which are fairly common but less effective against targets, especially mutants, and those made before the nuclear war, which are rare and highly powerful, but are also necessary to purchase gear or items such as filters for the gas mask and med kits. Thus, the player is forced to manage their resources with care.
, so im sure it must be the same over there) im sure it is on Xbox and most probably Ps3 as well. (but i am not sure)