Synthesia 10.3 Unlock Key -

: The demo limits you to a handful of included tracks. Unlocking allows you to import and learn any MIDI song you find or create.

While the free version offers a taste of the experience, the Synthesia Unlock Key provides critical upgrades: Synthesia 10.3 Unlock Key

Synthesia product review - Awesome way to learn piano pieces! : The demo limits you to a handful of included tracks