On Tetris, everyone got the Brick Game Tetris handheld in Russia and Europe, because the Game Boy was expensive.

The machine was composed of a 4 bit HT1130 CPU.

IDK if the MAME programmers RE it yet.

http://web.archive.org/web/20150417011515/http://brickgame.b... (Portuguese).

https://en.wikipedia.org/wiki/Handheld_electronic_game#Handh...

https://forums.nesdev.org/viewtopic.php?t=14115

http://www.seanriddle.com/tms1100.html