I've recently been helping out with adding all the European Game Gear releases into the database, and thought I'd post the current list here in case there's anything been missed.
If anyone can spot anything not listed here (and ideally support it with a pic), let us know!

Confirmed European releases (200)

Addams Family, The
Adventures of Batman & Robin, The
Aerial Assualt
Aladdin
Alien 3
Alien Syndrome
Archer MacLean's Dropzone
Arena
Ariel: The Little Mermaid
Asterix and the Great Rescue
Asterix and the Secret Mission
Ax Battler: A Legend of Golden Axe
Ayrton Senna's Super Monaco GP II
Baku Baku Animal
Batman Forever
Batman Returns
Battletoads
Bonkers Wax Up!
Bram Stoker's Dracula
Bugs Bunny in Double Trouble
Castle of Illusion starring Mickey Mouse
Chakan
Championship Hockey
Cheese Cat-Astrophe starring Speedy Gonzales
Chessmaster, The
Chuck Rock
Chuck Rock II: Son of Chuck
CJ Elephant Fugitive
Clutch Hitter
Columns
Cool Spot
Cosmic Spacehead
Crash Dummies
Crystal Warriors
Daffy Duck in Hollywood
Deep Duck Trouble starring Donald Duck
Defenders of Oasis
Desert Speedtrap
Desert Strike
Devilish
Disney Double Pack
Double Dragon: The Revenge of Billy Lee
Dr Robotnik's Mean Bean Machine
Dragon Crystal
Dragon: The Brucle Lee Story
Dynamite Headdy
Earthworm Jim
Ecco the Dolphin
Ecco: The Tides of Time
Ernie Els Golf
Evander Holyfield's 'Real Deal' Boxing
Excellent Dizzy Collection
F1
F1 World Championship Edition
F-15 Strike Eagle
Factory Panic
Fantasy Zone
Fantastic Dizzy
Fatal Fury Special
FIFA International Soccer
FIFA '96
Galaga 2
Garfield: Caught in the Act
George Foreman's KO Boxing
Global Gladiators
G-LOC: Air Battle
GP Rider
Halley Wars
Home Alone
Hook
Hurricanes
Incredible Hulk, The
Indiana Jones and the Last Crusade
Itchy & Scratchy Game, The
James Bond 007: The Duel
James Pond 2: Robocod
James Pond 3: Operation Starfish
Joe Montana Football
Judge Dredd
Jungle Book, The
Jurassic Park
Kawasaki Superbikes
Klax
Krusty's Super Fun House
Land of Illusion starring Mickey Mouse
Legend of Illusion starring Mickey Mouse
Lemmings
Lion King, The
Lucky Dime Caper starring Donald Duck, The
Madden '96
Man Overboard!
Marble Madness
Marko's Magic Football
Master of Darkness
Micro Machines
Micro Machines 2: Turbo Tournament
Mighty Morphin' Power Rangers
Mighty Morphin' Power Rangers: The Movie
Monster Truck Wars
Mortal Kombat
Mortal Kombat 3
Mortal Kombat II
MTV's Beavis & Butthead
NBA Jam
NBA Jam TE
NFL Quarterback Club
NHL Hockey
Ninja Gaiden
Olympic Gold
Ottifants, The
Out Run
Out Run Europa
Paperboy
Pengo
Pete Sampras Tennis
PGA Tour Golf
PGA Tour Golf II
PGA Tour Golf '96
Phantom 2040
Popils
Power Drive
Power Strike II
Predator 2
Primal Rage
Prince of Persia
Psychic World
Putt & Putter
Quest for the Shanven Yak starring Ren & Stimpy
Revenge of Drancon
Rise of the Robots
Ristar
Road Rash
Robocop 3
Robocop vs. Terminator
Schtroumpfs Autour du Monde, Les
Sega Game Pack 4-in-1
Sensible Soccer: Euiropean Champions
Shinobi
Shinobi II: The Silent Fury
Simpsons, The: Bart vs. the Space Mutants
Simpsons, The: Bart vs. the World
Slider
Smurfs, The
Solitaire Poker
Sonic 2-in-1
Sonic Blast
Sonic Drift Racing
Sonic Labyrinth
Sonic Spinball
Sonic the Hedgehog
Sonic the Hedgehog 2
Sonic the Hedgehog Chaos
Sonic the Hedgehog Triple Trouble
Space Harrier
Spider-Man
Spider-Man: Return of the Sinister Six
Star Wars
Stargate
Streets of Rage
Streets of Rage II
Strider Returns
Striker
Super Columns
Super Kick Off
Super Monaco GP
Super Off Road
Super Smash TV
Super Space Invaders
Super Star Wars: Return of the Jedi
Superman: The Man of Steel
Surf Ninjas
T2 Terminator 2: Judgement Day
T2: The Arcade Game
Tails' Adventure
Talespin
Tarzan (Disney's)
Taz in Escape from Mars
Taz-mania
Tempo Jr
Terminator, The
Tintin au Tibet
Tom and Jerry: The Movie
True Lies
Ultimate Soccer
Virtua Fighter Animation
VR Troopers
Wimbledon
Winter Olympics
Wizard Pinball
Wolfchild
Wonder Boy
Wonderboy: The Dragons Trap
Woody Pop
World Class Leaderboard
World Cup Soccer
World Cup USA '94
WWF Raw
WWF Wrestlemania: Steel Cage Challenge
X-Men: GameMaster's Legacy
Zool

Thanks!