CD-i member Michiel Roos brought another previously unknown CD-i to our attention: Algebra TV Interactive - Tested in 1995 but as far as we know it did not get any further than this. It looks like an interesting approach of what Philips visioned to be the most important themes for the CD-i format: Interactive Television and an educational value. It might be an adaptation of a (fictional) TV show or it might have been evolved in an existing CD-i series like 'Stickybear'. Many examples of kids titles on CD-i with an educational theme, but it might also be lost part in the School 2000 project, which Philips contributed to in the Ninetees and used CD-i to be the leading platform in this.
[Thanks, Michiel Roos]