Everyone has a rarity list for the Sega Master System. This one is my opinion. I have spent countless hours on Ebay and endless lists of Websites. So this is what I came up with.

C = Common

U = Uncommon

R = Rare

ER = Extremely Rare

UR = Unbelievably Rare

4 Pak All Action ER

A Turma Da Monica Tec Toy C

Ace of Aces R

Action Fighter U

Action Pack Tec Toy

Addams Family ER

Aerial Assault R

Afterburner C

Air Rescue R

Disney's Aladdin U

A. Kidd Lost Stars R

A. Kidd HiTec World R

A. Kidd Mir. World C

A. Kidd Shi. World ER

Alf Sega ER

Alien 3 C

Alien Storm U

Alien Syndrome C

Altered Beast C

American Baseball U

Ameri. Pro Football C

Andre Agassi Tennis R

Arcade Smash Hits U

Ariel Little Mermad

Assault City (pad) R

Assault City (gun) R

Asterix Sega R

Ast. Secret Mission R

Ast. Great Rescue R

Astro Warrior C

Ast Warrior/Pit Pot ER

Ayrton Senna GP C

Aztec Adventure C

Back to Future 2 U

Back to Future 3 R

Bank Panic (card) UR

Bank Panic (cart) U

Bart Space Mutants ER

Bart vs the World F. R

Basketball Nitemare U

Batman Returns U

Battle Out Run U

Battletoads

Black Belt C

Blade Eagle 3D U

Bomber Raid C

Bonanza Brothers U

Bram Stoker Dracula R

Bubble Bobble R

Buggy Run ER

Buster Dougl Boxing ER

California Games C

California Games 2 ER

Captain Silver U

Casino Games C

Castle of Illusion Sega U

Champions of Europe C

Chapolim Tec Toy

Chase HQ U

Cheese Catastrophe Tec Toy

Choplifter C

Chuck Rock U

Chuck Rock 2 U

Cloud Master U

Columns R

Cool Spot U

Cosmic Spacehead ER

Crash Dummies C

Cyber Shinobi R

Cyborg Hunter C

Danan Jungle Figter C

Dead Angle U

Deep Duck Trouble ER

Desert Speedtrap C

Desert Strike R

Dick Tracy R

Double Dragon C

Double Hawk R

Dr Robotniks Bean ER

Dragon Crystal C

Driving Pack Tec Toy

Dynamite Duke R

Dynamite Dux U

Ecco the Dolphin R

Ecco 2: Tides Time ER

Enduro Racer C

Eswat R

F1 C

F16 Fighter (card) C

F16 Fighter (cart) C

F16 Falcon (card) C

Fantastic Dizzy R

Fantasy Zone C

Fantasy Zone- Maze R

Fantasy Zone 2 C

Fire and Forget 2 R

Fire and Ice Tec Toy

Flash R

Forgotten Worlds R

G-Loc Sega R

G.B.Esportes Rad Tec Toy

Gain Ground R

Galaxy Force R

Game Box Esportes Tec Toy

Gangster Town C

Gauntlet C

George F. KO Boxing ER

Geralddinho Tec Toy

Ghost House (card) U

Ghost House (cart) C

Ghostbusters C

Ghouls and Ghosts ER

Global Defense C

Global Gladiators C

Global Golf C

Golden Axe R

Golden Axe Warrior R

Golfamania C

Golvellius C

GP Rider C

Great Baseball C

Great Basketball C

Great Football C

Great Golf C

Great Ice Hockey C

Great Soccer C

Great Volleyball C

Hang On (card) ER

Hang On (cart) U

Hang On/Ast Warrior C

Hang On/Safari Hunt C

Heroes of the Lance C

Impossible Mission ER

Indiana Jones R

James Bond 007 ER

Joe Montan Football R

Jungle Book U

Jurassic Park R

Kenseiden C

King's Quest ER

Klax R

Krustys Fun House ER

Kung Fu Kid R

Land of Illusion R

Laser Ghost U

Lemmings C

Line of Fire ER

Lord of the Sword C

Lucky Dime Caper C

Mahjong ER

Marble Madness C

Marks Shoot/Trap C

Marks/Trap/Safari R

Master Games 1 R

Master of Darkness C

Masters of Combat ER

Maze Hunter 3D U

Maze Hunter 3D II UR

Mercs U

Michael Moonwalker R

Micro Machines R

Miracle Warriors C

Missile Defence 3D C

Monic Castle Dragao Tec Toy

Monopoly C

Montezuma's Revenge R

Mortal Kombat U

Mortal Kombat 2 ER

Mortal Kombat 3 ER

Ms Pacman R

My Hero (card) C

My Hero (cart) C

New Zealand Story U

Ninja Gaiden R

Ninja, The C

Olympic Gold C

Operation Wolf U

Ottifants R

Out Run C

Out Run 3D ER

Outrun Europa R

Pacmania R

Paperboy R

Parlour Games C

Pat Riley Basketbal UR

Penguin Land C

PGA Tour Golf C

Phantasy Star C

Pit Fighter R

Populous C

Poseiden Wars 3D R

Power Strike ER

Power Strike 2 UR

Predator 2 R

Prince of Persia C

Pro Wrestling C

Psychic World R

Psycho Fox R

Putt Putter Golf C

Quartet U

R-Type U

Rainbow Islands ER

Rambo Sega C

Rambo Blood Part II C

Rambo III U

Rampage C

Rampart R

Rastan C

RC Grand Prix R

Reggie Jack Basebal C

Ren & Stimpy- Yak Tec Toy

Renegade ER

Rescue Mission C

Road Rash ER

Robocod C

Robocop 3 ER

Robocop Terminator R

Rocky C

Running Battle C

Safari Hunt C

Sagaia R

Sapo Xule Tec Toy

Scramble Spirits R

Secret Command C

Sega Chess C

Sega Double Pack (Jungle Book / Jurassic Park ) UR

Sensible Soccer C

Shadow Dancer C

Shadow of the Beast C

Shanghai C

Shinobi C

Shooting Gallery C

Slap Shot R

Smurfs, the Tec Toy

Sonic Chaos ER

Sonic Spinball ER

Sonic the Hedgehog C

Sonic Hedgehog 2 C

Space Gun U

Space Harrier C

Space Harrier 3D U

Special Cri Invest U

Speedball U

Speedball 2 C

Spellcaster C

Spiderman C

Spidrman Sinister 6 ER

Sports Pack 1 Tec Toy

Sports Pack 2 Tec Toy

Sports Pad Football U

Spy vs Spy (card) R

Spy vs Spy (cart) R

Star Wars ER

Streets of Rage R

Streets of Rage 2 ER

Strider Sega R

Strider 2 R

Submarine Attack R

Summer Games C

Super Cross Tec Toy

Super Kick Off C

Super Monaco GP C

Super Off Road Race R

Super Smash TV R

Super Space Invader R

Super Tennis (card) C

Super Tennis (cart) C

Superman U

T2: Arcade Game ER

T2: Judgement Day ER

Tazmania C

Tecmo World Socc 93 C

Teddy Boy (card ) U

Teddy Boy (cart) R

Tennis Ace C

Terminator U

Thunderblade C

Thunderblade 2 (DON’T EXSIST UNTIL I SEE IT)

Time Soldiers C

Tom and Jerry C

Transbot (card) U

Transbot (cart) C

Trivial Pursuit C

TV Colosso Tec Toy

Ultima IV R

Vigilante R

Walter Pay Football R

Wanted C

Where World Carmen U

Wimbledon Tennis C

Wimbledon Tennis 2 U

Winter Games R

Winter Olympics C

Wolfchild ER

Wonderboy C

Wonderboy 3 R

Wonderboy 4 UR

Wonderboy Mons Land C

Woody Pop UUR (DON’T EXSIST UNTIL I SEE IT)

World Lboard Golf C

World Cup Italia 90 C

World Cup USA 94 C

World Games C

World Grand Prix C

World Soccer C

World Tourn Golf C

WWF Steel Challenge ER

Xenon 2 R

Ys Vanished Omens C

Zaxxon 3D C

Zillion C

Zillion 2 Tri Form U

Zool ER