I found some free maths games here: www.enthuseeducation.co.uk/freegames
I have only used the times tables one, but I thought the bit on what to do if your child struggles with times tables was useful. We followed the idea about the building towers and it did really help.
Does anyone else have any ideas about how to help a 6 year old learn their simple times tables? She is ok with the 2's, but none of the others.