[Meat Miracle]

Alisia Dragoon
Toejam & Earl 1-2
Ranger X
Aladdin
Streets of Rage 2
Bare Knuckle 3
Ecco 1-2
Comix Zone
The Ooze
Gunstar Heroes (you'll either think the game is retarded or great, no middle ground)
Mercs (average port but has an Original mode which kicks ass)
Strider (the first one)
Beavis & Butthead (highly unconventional adventure game)
Columns
Super Hang-on (again average port, but has a kickass original mode)
X-Men 1-2
Vectorman (the second game is crap, but the first one is very impressive)

[Morph]

Beyond Oasis.

[winterhell]

I wont repeat already mentioned ones.
I had immense amount of fun with
Splatterhouse 3
Maui Mallard in Cold Shadow
Ghouls 'n Ghosts (multiplatform)
Ultimate Mortal Kombat 3

[Infiniti]

DalekSam, on 17 May 2015 - 06:31 AM, said:

Thunder Force IV

So glad someone said it!
Most people have already said the ones I was going to add, But I'd like to throw Shining Force 2 and Street Fighter 2 Championship Edition in there.

[doc eggfan]

Shining Force II was my first experience of a tactical rpg - I sunk so many hours into it as a kid, it consumed my life.

[Vangar]

- Crusader of Centy / Soliel
https://www.youtube....h?v=eBWCYH71qoU
Amazing Zelda clone that stands on its own, unique play style where animals you collect can be mixed and matched to give you abilities. Unlike a link to the past, the story actually has time travel as well.

- Puggsy
https://www.youtube....h?v=GKTHHtmnpVA
Originally an Amiga title, this game uses a block physics engine that was pretty mind blowing for myself at the time. Solve puzzles and find secret exits to levels that will take you to new paths on the map. This version is far superior to the Amiga version.

- Kid Chameleon
https://www.youtube....h?v=1BH5GY_TIIk
This is another unique game, you pickup masks to become different characters that have different abilities. Some of the best masks don't appear until much later in the game, such as the skateboarding mask the art style gets gritty

- Beyond Oasis / The Story of Thor
https://www.youtube....h?v=Kt2qHulcUR0
Collect spirits to help you. Very zelda like and a great game.

- Fantastic Dizzy
https://www.youtube....h?v=IshgDSr44hc
Also originally on the Amgia, this is not just a port but a complete graphic & audio overhaul. A puzzle game where you must find items to help you progress through the level while trying to collect every star in the world.

- Cosmic Space Head
https://www.youtube....h?v=FSpiI1y0DLc
This is a point-and-click adventure game with Platforming between areas. It has a similar feel to The Secret of Monkey Island, not only because of the puzzle item collection, but because some of the item uses are pretty silly.

- Shining Force 2
https://www.youtube....h?v=JPcpMkBdgEY
A tactical RPG with better graphics and tweaked gameplay then the previous game. Lots of hidden characters to find.

- Thunder Force IV
https://www.youtube....h?v=HDpWMyZnaCM
I love shooters, and this is one of the best on the Genesis.

- Wonder Boy in Monster World
https://www.youtube....h?v=oullp_KrG9U
I know some people prefer the Master System version, but this one is great. The game feels 'linear' until you unlock some items and then you realize the whole over world has so much to explore! Also you mentioned you have a flash cart, so...

- Wonder Boy in Monster World IV (With translation patch)
https://www.youtube....h?v=uM88wnYdnVo
This one is also great, but never got an English version for the mega drive. Lucky for you though, you can flash on the translated ROM.

This post has been edited by Vangar: 17 May 2015 - 06:56 PM

[Skyler]

Most of my picks have been mentioned, but I have some sports games to suggest.

NBA Jam
World Series Baseball 98
Triple Play 96
Prime Time Football Starring Deion Sanders

[Pirate Dragon]

Magical Hat no Buttobi Turbo! Daibouken

Really great platformer, spiritual successor to Psycho Fox, was butchered for western release to become Decap Attack, which lost all of the charm of the original.

[The KKM]

so does retro just not consider the phantasy star series classics, or did I miss the post where II, III, and IV were mentioned?

also pulseman if it hasn't, I was focused only on searching "phantasy" and didn't notice if someone said pulseman

[superevil]

I'd like to second Dynamite Heady. It's a fantastic and quirky game by Treasure.

[Uberham]

Mega-Lo-Mania/Tyrants: Fight Through Time
Micro Machines Military
General Chaos
The Chaos Engine
Alien Storm

[Xeta]

Shinobi III. Come on guys, you can't forget this gem!

Also, Contra HardCorps.

There are some others, but I'm fairly certain they've already been brought up in this thread.

[E-122-Psi]

Puyo Puyo/Dr Robotnik's Mean Machine is one of the best puzzle games out there (okay technically it's Sonic but just barely). Puyo Puyo Tsu is good for the same reasons.

Golden Axe is a fun button masher, naturally so are it's sequels.

Seconded Rocket Knight Adventures and Sparkster. Great platformers that outshine many of the Sonic rip offs of the day by being far more innovative.

Wonder Boy 3: Monster Lair is good (though I like the Turbografx one even more).

This post has been edited by E-122-Psi: 18 May 2015 - 10:00 AM

[Dark Sonic]

Much obliged for the suggestions everyone. I finally have a decent Genesis library for the first time in... well forever. Now just to get around to playing them all.

[winterhell]

Forgot to mention Cool Spot.
Oh and if you like Game Overs, see Sunset Riders.