Fun math facts game?

My very mathy child is getting ready to start algebra and geometry. However, she doesn't know her times table and is getting frustrated at how long higher level problems take when she has to work it out from scratch each time she sees multiplication and/or division (she knows the steps for multi-digit multiplication and long division and is using them to solve harder problems, but it takes forever). Does anyone know of a genuinely fun math facts game that I could get for her?