IL-2 Sturmovik: Forgotten Battles is a STAND ALONE product
The Forgotten Battles consists of:

20 single-player missions
10 multiplayer missions
5 new maps

Dynamic campaigns that are working on all existing maps of IL-2 Sturmovik and IL-2 Sturmovik: Forgotten Battles

Forgotten Battles offers all the gameplay of IL-2 Sturmovik, plus many new additions. These include (but are not limited to):

30 new flyable aircraft
23 new AI-controlled aircraft
New AI ground objects and vehicles for each new map area, with new 3D building models
Ranking and award system for Finnish and Hungarian pilots
Selectable custom user-made skins in single play mode for players and all AI aircraft
All IL-2 Sturmovik: Forgotten Battles aircraft available in Quick Mission Builder, except seaplanes and gliders
Improved flight dynamics
More realistic AI scripting to create more realistic battles
New engine management relating to radiators, superchargers and fuel mixture control for different altitudes
Online track recorder and editor
A New system of single play track recording and editing
Search lights and barrage balloons (including intercommunication with AA artillery)
New ships including the Russian battleship Marat, Russian cruisers Aurora and Kirov and German cruiser Niobe (but not limited to)
Play up to 32 players online in dogfight and in cooperative modes (depending on your internet connection)
IL-2 Sturmovik and IL-2 Sturmovik: Forgotten Battles are not compatible with each other when playing online

IL-2 Sturmovik: Forgotten Battles includes from the original IL-2 Sturmovik game:

All aircraft (including those released for free in add-ons)

All maps

IL-2 Sturmovik: Forgotten Battles does not include from the original IL-2 Sturmovik game:

The single missions

The multiplayer missions

The 3 offline single player campaigns

DYNAMIC CAMPAIGN GENERATOR
IL-2 Sturmovik: Forgotten Battles introduces a dynamic campaign. The dynamic campaigns are automatically generated, and the player can select his or her nation, squadron, and aircraft to fly. Players can also decide when they want to join the war. After the completion of each mission, the results will be processed and another mission will automatically be generated - and so on, until the end of war. Results of one mission will carry on to the next and no two missions will be the same.
During the campaigns, forces will advance or retreat, based on the history of the battles. However, frontline movements can speed up or slow down in limited degree. Additionally, resource tracking is present and objects destroyed in one mission will stay destroyed in the next. Every destroyed plane, friendly or hostile, reduces the number of planes of this type in the theatre, making their appearance less likely. Destroyed trains and transport columns will affect supply rate. If an ace is killed or captured, he will not appear in future battles.

Squadron management will also play a key-role in the dynamic campaign system. Every pilot has a name, photo (it is possible to replace the default photos) a rank, medals, sorties and kills. Each pilot's skill level is defined by combat experience. Pilots can be killed, captured, promoted, awarded or transferred. Losses are replaced, but new pilots will likely have minimal combat experience. Each squadron has a limited amount of combat ready planes, and if this number drops below some point, the squadron will be short-handed.

Players may choose to play from any time of 1941 to 1945 and fly for either Germany, Russia, Finland or Hungary.

Minimum Requirements:
Pentium III 800/AMD Athlon 700 or better 256 MB of RAM ( 512 MB is recommended) Windows(r)98/ME/2000/XP