The first trailer from the
Games Convention in Leipzig showed new features such as 3D graphics, possible due to the new
Clausewitz Engine. Paradox also released a series of developer diaries and video showcases. Although happy with the scope of
Hearts of Iron II, lead designer
Johan Andersson wanted to improve upon every aspect of the game, starting again with a new engine. The game's
artificial intelligence (AI) was designed to be able to achieve strategic objectives and control forces delegated to it, including whole
theatres of operation. The AI can also remember and compare strategic possibilities as circumstances change. The content of the map was also altered; the number of provinces was increased to more than 15,000 over ''Hearts of Iron II's'' 2,600. == Reception ==