You may have met Dottie and Sam before. They both feature on a Maths Mysteries CD-ROM, which you may have seen at school. You'll need to have Flash Player version 6 installed in order to play the activities. You can download it for free at Macromedia.
Sam Lava is a scientist. He's studying the Cold Star at the moment, and you can help him to guard the planet against all sorts of villains in Sam Lava's Space Adventure!

Wherever there's a maths mystery, Dottie Double will get to the bottom of it - with a little help from you! Get sleuthing for her latest challenge:Dottie Double at the Pop Awards.