Today the MSX game 'Sonyc' was declared freeware by its makers. Sonyc is a fast platform game based on the legendary Sonic the Hedgehog games known from Sega consoles. If you have an MSX2+ or higher (MSX2 with an V9958 will do as well), 128KB RAM and MSX-Music you really should try this game. If you like, you can order the original disk, including case and disklabels for only 1 euro.
Relevant link: Manuel Pazos' website