All serials of season 18 were released individually in between 2004 and 2011.

All serials of season 19 were released individually in between 2003 and 2011.

All serials of season 15 were released individually in between 2005 and 2011.

All serials of season 24 were released individually in between 2009 and 2012.

All serials of season 21 were released individually in between 2002 and 2011.

The games were released individually and generally received good initial reviews.

All serials of season 25 were released individually in between 2001 and 2012.

All serials of season 17 are still being released individually.

All serials of season 22 were released individually in between 2001 and 2009.

The first season was released individually on April 15, 2010.