You wan't some more Medals / Medal points but you are to lazy, to play complicated* games?
This is a little how to avoid the complicated games.
This is not an cheat tutorial. (Of course... There are some cheating tools, which work on most of the games, but where is the fun? ;)

For those who didn't find the "games with medals" link:
http://www.newgrounds.com/game/gameswi thmedals/

*Games which took really long are for example:
Vector Boom (http://www.newgrounds.com/portal/view /501640)
or Epic Battle II
(Even if both games are really fun)

If you want to get much medalpoints:
Play this game...
Communist in Space
http://www.newgrounds.com/portal/view/
517807
There are three medals... Two of them are 50 medalpoints worth.
I beat the game in 5 minutes :D

Tip: Try to get as much points as possible on your way up. When you are flying back, move your cursor to the right border of the game. Now klick your soviet Russian and pull him out of the game ;)
Now the rockets won't hurt you and you'll get 100 points

In case you prefer more medals but less points, try out this game:
http://www.newgrounds.com/portal/view/
516979
(Seven's Second Adventure)

You can get 6 medals without even thinking. (altogether 85 points)
First medal: Spend less than 5 minutes in the instuction.
Secound medal: Start the game and press "A"
Third medal: Press M while you are playing.
Fourth medal: View the credits (in the main menu)
Fifth medal: spend more than 5 minutes on the instruction :DD (Play another game while the Instruction is open)
Sixth medal: View all of the Bios (main menu)
There are 3 more medals, but they are not THAT easy to get :D...

Another game:
D-Day Defender:
http://www.newgrounds.com/portal/view/
498385
Its not that hard to get at least 5 medals but you should like the game :)

How to have fun AND get 500 medal points an 12 medals:
Play Miamy Shark:
http://www.newgrounds.com/portal/view/
513760

Tips:
Drive deep and come up fast, to get the stuff in the Air.
If you want much medals wait for an plane or helicopter to arrive. Don't jump earlier. You might miss the planes which you have to get down to get medals. (unless you want the "Crush 95 Sailing Yachts" medal.

Another good game is Gretel and Hansel:
http://www.newgrounds.com/portal/view/
515322
It tooks a bit longer than the other games. You shouldn't play it, if you don't like that kind of game.
The advantage of this is, that there are two official walktrough, if you get bored.
In addition you can earn 18 medals and 500 medal points :D

Walkthrough:
http://www.gretelandhansel.com/walkthr ough.html

Video Walkthrough:
http://www.youtube.com/watch?v=UouWyOh W7kk
(It's also funny to play this game without walkthrough)

How to get medals and have fun:
The Dadgame:
(One of my favourite games)
http://www.newgrounds.com/portal/view/
498385
If you beat the story mode on easy you'll get at least 7 of 16 medals.
It's also an funny game, so you could try to get the other medals, too. :)

Another funny game:
Toss The Turtle:
http://www.newgrounds.com/portal/view/
508440

Walktrough:
My personal tips:
- Launch the turtle at 45°.
- Don't waste your shots! Try to shoot the turtle shortly before it hit the ground. Try to shot the lowest point of
the turtle.
- Buy the rocket pack. It will bring you up and you can use it (once you have brouht it) one time every launch for
free.
- If you have enought Money buy the Revolver. Skip the Desert Eagle and buy the UZI
- When you have the UZI:
- Don't waste more than one bullet per shot. Try to still to shot the turtle shortly before it hit the ground.
- Buy the Big Cannon or the Super cannon as soon as you got enought money.
- Buy the chest bomb. It'll rescue you from spikes. You can use it only one time, then you have to by a new one.
- Don't buy nukes in the beginning. (Not before you earn more than 10.000 per shot)
- As soon as you brought the Tank and the golden canon, you'll get all the other medals in no-time.
- Buy everything to get "golden shell"

The secret Questionmark:
It's between Blast and CO (in the Shopping menu)

Good luck and have fun;)

...And of course, if there are some gramatical or spelling mistakes i didn't recognize please correct me :)
...And please review my post :)