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In world 4-4.
in the water level 4:1
At the end of world 1-4.
Phineas and Ferb - 2007 The Fast and the Phineas 1-4 is rated/received certificates of: Australia:G
it was in their back yard
Phineas and Ferb - 2007 The Fast and the Phineas 1-4 was released on: USA: 2 February 2008
It does appear that the last season of Phineas and Ferb was the 4th season.
Yes there will be. Go to the Phineas and Ferb Wiki and look up season 4.
Phineas and Ferb - 2007 Druselsteinoween was released on: USA: 4 October 2013
go to the third level where the toolbox is in the mud search the scrap pile to obtain the rope for level 4
Phineas and Ferb - 2007 Bully Bust 4-3 was released on: USA: 18 January 2013
Phineas and Ferb - 2007 Der Kinderlumper 4-6 was released on: USA: 15 February 2013