The number of casual games that keep you playing for 7 days is very small.

The number of casual games that keep you playing for 7 days AND are fun to replay is even smaller.

I'm still playing VV and VV2 all this time later. The only other game I'm still playing years after buying it is Sims 2, and that isn't a casual game... and doesn't cost under $20, either.

Just sayin'.....