I guess the list shouldn't be too long, so here's the one for JagdGeschwader :
- 4 different WW2 aircrafts to choose from
- 4 different scenarios
- Stunning graphics using OpenGL (huge terrains, foliage, water reflections, explosions and more)
- Arcade-like aircraft physics using the Newton Game Dynamics engine
- Two players on one PC using splitscreen or two players over LAN/Internet
Hope that's enough and I hopefully didn't forget any of the features from my entry
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