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Comedy Zen - 2006 1-4 was released on: USA: 2006
You receive a Zen Garden on the level 5-4 at the end
House Crashers - 2009 Zen Bedroom 4-4 was released on: USA: 2011 USA: 25 April 2011
5-4
Indoors Out - 2008 Zen Den 4-5 was released on: USA: 3 May 2010
koan
One on One - 2001 Zen Daddy 4-2 was released on: USA: 27 September 2004
Carter Can - 2007 A Zen Bathroom Retreat 4-9 was released on: USA: 21 February 2009
My Fair Wedding - 2008 Zen Bride 3-4 was released on: USA: 27 June 2010
you need to finish a level in adventure mode,complete the level 5-4 to get zen garden.
Yes. As of 4/22/2012 Zen Garden is implemented in Plants VS. Zombies iPad.
Celebrities at Home - 2012 Zen Inspired Spaces 2-4 was released on: USA: 1 May 2012