Master System
A graphic board peripheral was in development for the Master System which was going to be released in 1987. Players could draw using a fully editable 16 colors bitmap with a 176x144 pixel area. The software for the peripheral was being designed by Kazuo Wakihara who had worked on Columns. The graphic board would've also been compatible with the Genesis.
Contributed by KnowledgeBase
Many releases of the Master System included games in the console's BIOS that could be accessed by booting up the system without a cartridge in it. Some releases included multiple games, with one in Brazil boasting 131, but most included one of the following:

Snail Maze
Hang-On & Safari Hunt
Missile Defense 3-D
Alex Kidd in Miracle World
Sonic the Hedgehog
Contributed by KidDivinegon
Due to South Korea banning Japanese cultural imports at the end of World War II, the Master System was distributed by South Korean company Samsung, and was named the Gam*Boy.
Contributed by Berry