Children can earn Leapworld tokens on the handheld, then use them to create a character, build a home and customise them.
Exclusive online games and activities automatically adapt, so that as they play children can unlock maths and literacy learning matching their skill level.
Leapworld also offers "beyond basics" adventures on topics such as science, social studies and life skills, for enhancements to Leapster2 play.
"We asked parents what they look for in online experiences for their children," said Craig Hendrickson, senior vice president and chief product officer, "and parents said safety, fun, and education. In response, we are excited to launch Leapworld, an online space that not only addresses these three criteria, but also sets a new standard for the innovative, personalised play that is possible only in the combined online and offline experiences Leapfrog offers."