I can recommend the two blobs games, which are shown first on the site. The second blob game has the option of using the piano pitches instead of the blobs (see the "options" button after you start the game).
Remember that this site is designed in the UK, so the terminology differs from what we typically use in American classrooms.
Please contact me if I can support you in trying Takadimi in your classroom! I'd love to work with you one-on-one or design PD for you and your colleagues.
NCMEA 2016 Professional Development Conference Winston-Salem, NC November 5, 2016