Simon the Snake by nitrofurano is a twist of two well known concepts. It puts the games “Simon” and “Snake” into one pot. Just go ahead and try it on your own, it’s pretty entertaining. Unfortunately as of now there is no scoring system yet.

http://www.smspower.org/Homebrew/SimonTheSnake-SMS

Flip Flap is a Sega Master System game by BrambleG. Navigate between all pipes without colliding.

http://www.smspower.org/Homebrew/FlipFlap-SMS

Racer by hang-on is a very simple racing game for the Sega Master System. Just make sure you do not collide with other cars getting in your way.

Bloki is a Tetris style game for the Sega Master System. It has been developed by tripledonkey and sherpa.

Ski Master is a game by efry, Niloct and Edwin Diaz. Fire up your Sega Master System for a slight skiing lesson.

http://www.smspower.org/Homebrew/SkiMaster-SMS

Racer by hang-on is a very simple racing game for the Sega Master System. Just make sure you do not collide with other cars getting in your way.

http://www.smspower.org/Homebrew/Racer-SMS

Bloki is a Tetris style game for the Sega Master System. It has been developed by tripledonkey and sherpa.

http://www.smspower.org/Homebrew/Bloki-SMS

Gaudream is a Flappy Bird style game for the Sega Master System. It has been developed by DanySnowman (Graphics), Davidian (Sound) and Kusfo (Code). It got recently updated and is now at version 0.04.

http://www.smspower.org/Homebrew/Gaudream-SMS

Gaudream is a Flappy Bird style game for the Sega Master System. It has been developed by DanySnowman (Graphics), Davidian (Sound) and Kusfo (Code).

Thanks to http://retrogamingmagazine.com/2015/04/10/gaudream-brings-flappy-bird-style-action-to-the-sega-master-system/ for the news.

http://www.smspower.org/Homebrew/Gaudream-SMS

Brawl is a somewhat interesting new homebrew game for the Sega Master System. It mixes various known video games characters such as Alex Kidd and let you fight against other well known franchises. Also it takes backgrounds from Wonderboy and other games and mixes it up, which in sum makes up a nice gaming soup á la Super Smash Bros. The game is still in (slow) development and even Sonic is said to make his appearance in this game. Make sure to keep your eye on this project as it really develops nice.

This is a perfect example of what free, non commercial, fan games can look alike.