Valhalla Knights games in order

All 4 games of the Valhalla Knights series in the order they came out, from Valhalla Knights (2006) to Valhalla Knights 3 (2013).

1. 
   Valhalla KnightsPSP · Marvelous Entertainment (pub.)
   4431 Aug
2. 
   Valhalla Knights 2PSP · Marvelous Entertainment (pub.)
   29 May
3. 
   Valhalla Knights: Eldar SagaWii · K2
   3429 Sep
4. 
   Valhalla Knights 3Vita · Marvelous (pub.)
   5023 May