A system where a child or other individual arranges one or more computer-recognizable characters on a working platform to spell words or provide a mathematical result in response to computer generated questions or prompts, the system then indicating whether the words or mathematical result is correct....http://www.google.com/patents/US20040142309?utm_source=gb-gplus-sharePatent US20040142309 - Computer software and portable memory for an electronic educational toy having a touch sensitive surface
