Armored Core 4 Preview - GameSpot

From Software's other big-robot franchise is headed to the new consoles in a matter of weeks, and we tried out the latest PlayStation 3 build.
The fourth game in the Armored Core series rockets onto both the PlayStation 3 and the Xbox 360.

Armored Core 4 (2006) - MobyGames

Armored Core 4 Reviews - GameSpot

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Armored Core 4 - Wikipedia

Armored Core: Nine Breaker Review - GameSpot

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Armored Core 2: Another Age - Wikipedia

Armored Core V - Wikipedia

Armored Core 4 Review - GameSpot