Action

Line Game Don't hit the walls type game
The Fight for Glorton Some dumb NewGrounds meme based fighter that's pretty fun.
Fishy Eat small fish to become a bigger fish while avoiding the bigger than you fish.
Drakojan Skies 3 Lead your team of Omega Squadron pilots to defend your territory.
Jeu Chiant You're gonna LOVE this game.
Bee Dodger Dodge other Bees and collect coins for points.
Five Minutes To Kill(Yourself) You wander the office space finding ingenious ways to hurt yourself till you die.
Indestructo Tank You're a tank that bounces around to blow shit up.
Pretty Pretty Bang Bang Chain reaction game.
Moai Move the tower around and get as many heads as you can up the ladder.
Stair Fall Drag a stick figure down some stairs.
Flute Hero - Danish, play a flute Guitar Hero style.
Arrow Tag Use your cursor to grab objectives before time runs out.
Dolphin Olympics 2 Score as many points as possible in 2 minutes by swimming and flipping your dolphin.
Sprite Smash Play and fight as various pixilated TV show characters.
Mmeoww Bounce kittens to keep them from splattering all over the road.
Pyro Sand 2 Move a ship around and collect stuff. 1 minute time waster.
Warthog Launch Use grenades to launch a truck into aliens.
Attak Fighting game about using special moves to defeat your opponent.
Sittin' at a Bar Balance game. Cool song.
Flow Action/adventure/eat creatures.
AstroFlyer Collct stars and avoid stuff.
The Bounce Bounce off the ground with your giraffe, and grab the stars while avoiding deadly spheres of red.
Another Epilepsy Game Epilepsy warning! Guide mouse through stuff.
Amorphous+ Fast paced, hectic melee of multicolored blobs.
Aqua Bots Control 2 subs at the same time.
Too Many Ninjas Block and slice ninjas comming out you from all directions.
The Missile Game 3D HS Ever felt like flying a missile down a tube filled with rotating obstacles?
Microbe Kombat Pits microbes against each other in an ultimate confrontation- gladiator style.
Music Euphoria Target the green balls.
Crunchdown Brawler with some great features. In this game you can eat anything.
Booty Juggler Click stuff and throw stuff around.
Dad' N ME Fun brawler.
Spacerunner You’ll have to jump, duck, and roll at the right times or you’ll fall on your spaceface.
QWOP Flop around like an idiot. Great at parties.
Beat Beat Revolution Need translations!
Slush Invaders Game Use a variety of characters to repel the invasion once and for all.
Raptor Safari You have 5 minutes to take out as many Raptors as possible in your jeep.
Minotaur China Shop Help the customers to find what they want. More fun to just tear the place up though.
Fishing Girl Laid back awesome fishing game.
Brawler Whirled MMO-ish too.
Escapa! Click and run.
Nuclear Eagle Drag and click. Fling kids as a giant bird into your nest...
Notessimo Create and listen to songs you and others have made. In flash!
Pixel Pop Click fruit to the beat to not die.
Chain of Fire Click and run to ignite people on fire to win.
Ice Breaker (Different from the Viking game of the same name.)
Boomba Don't touch the walls.
Bible Fight The forum for this game is just as fun.
Music Catch 2 As much calm fun as the original. Collect musical notes with the mouse.
Death Dice Overdose EPILEPSY WARNING! Dodge the falling dice and eat pills to make you see things.
Ski Runner EPILEPSY WARNING!
Apocalypse Simple clicking game.
Hungry Space Eat things smaller than you to grow bigger.
Seed of Destruction
Death Vegas
Amateur Surgeon and Amateur Surgeon 2 Puzzle/twitchy/gore.
Tam's Tower Challenge (Game Show Type Game)
Card Toss.
Effing Hail Create bigger and bigger hail to destroy shit.
Blurst Needs Unity player. This one is sort of like bust a move, but with more creative challenges and adorable physics/animation.
Where's An Egg. Strange Russian game.
Bubble Trouble A whole lot of balls bouncing around and you gotta shoot them with a grappling hook to pop them. Gets pretty difficult, very addicting.
Escape The Red Giant Bounce between asteroids and rack up huge combos. Really fun game.
Hanna in a Choppa
Smacky Beat up friendly squirrels.
Flakboy Do as much damage to a ragdoll as you can with strategic placement of guns, mines, and spikes.
Pizza City Adult Swim game where you drive around delivering pizzas.
Dexter Bag Toss. Toss 3 garbage bags into the water for distance.
Barbarian Onslaught: The Secret of Steel It's a side scrolling hack'n'slash
Polygonal Fury It's one of those like chain reaction games where you click one thing to have it blow up and activate other objects.
Tower of Greed An amazingly addictive arcade game where you need to collect loot from the tower without getting too greedy.
Tarnation a simple but captivating action/puzzler where you need to stop different coloured balls of tar from contaminating your water supply.
Hover Kart It's kind of like mario kart, where you get missiles and mines and different power ups.
When the bomb goes off A short, but fun little game where you try to help people complete their goals before they are inevitably destroyed in about five seconds when a bomb goes off. If anything, I would compare it to the microgame style of WarioWare.
Balloono A multiplayer game in the style of Bomberman with crisp, cartoony graphics.
Ultimate Assassin 2 You are a ninja-assasin. Your mission is to kill the VIP without getting killed by the guards.
Indian Outlaw You are the Indian Outlaw! Grab your motorbike and kick some serious ass in the land of the free!
Gray You're in the middle of a riot, trying to convince people to calm down/switch sides. It's political allegory, but with a good twist ending.
NexGame Smash through ice walls or something. Quite annoying.
Pixel Grower Try to catch falling pixels, which aggregate onto your structure, causing you to build a huge branching tree-of-pixels thing.
Ninja. This is a pretty fun little cartoony ninja game.
Phosphor This is a full blooded, free browser based FPS (uses shockwave). There's only the 1 map, but it's large and varied with a good mix of all aspects. There's 5 weapons, a range of bot intelligences, and even better the ability to play against your friends over the internet.
Cursor Chaos WarioWare for your keyboard.
Giraffe Attack You dodge rockets while stretching to space. and the game gets progressively more difficult.
SpaceSmasher The most inventive brickbreaker I've ever seen.
Multitask Just what it sounds like.
Ninjufo You're half ninja, half ufo. You sneak around a facility disarming traps and Shiruken-ing enemies to steal yellow crates.
DADGAME You play as Dad and you have to destroy things and kill people and use things as weapons and vomit up weapons to use and also you shoot lasers from your eyes and play the guitar and when you do enough damage you are lit on fire and become invincible and spin around in a tornado of death.
Vox Populi, Vox Dei(a werewolf thriller) A game where you rape werewolves to save your girlfriend. Also you are a ninja. Also, werewolves pee on you and you die.
Pwong 2 Imagine you're playing pong during a 90's rave, and there's way more balls then there should be.
Hash In which you play a Jet-powered #, collecting tokens and dodging spikes/enemies/landmines/lightning.
Gibbets Use arrows to try to free someone from a hangman's noose.
The Tickler Crazy robot with grabbers and lasers that runs around squishing people.
Obechi
Miami Shark Fuck up Miami as a shark. You can even grab planes out of the sky and drag them down.
Juggerdome You are in a mech. Walk around and blow shit up gladiator style.
Death Penalty Shoot-out A combination of those silly football flash games with a zombie killer game.
Tiger Woods Wife Outrun
Infectonator You're given 60 seconds that counts down across each level, and you have to set off a zombie infection to kill/infect a certain number of people in each level.
Obey The Game WarioWare meets Simon Says.
Endless Migration Try to fly a goose flock through to its migration.
Infectonator Christmas Edition
Robokill 2
Hobo Prison Brawl Just like it sounds.
Fly Hard starring Druce Millis.
Key Master 2 Fend off menacing beasts by typing their names.
Wavespark
Rose & Camellia A game about noble woman slapping each other. It's a Japanese game but it has been translated. It's also pretty difficult.
Run Jesus Run a.k.a. The 10 Second Gospel Rage quit hard and fun.
Mountain Maniac A man who has had enough, and decided to destroy everything he can from atop his mountain.
Realm of the Mad God Acvtion/adventure/shooting.
Sydney Shark Sequel to Miami Shark.
Chaos Faction 2 Basically, a flash version of Smash Bros.
Trafalgar Origins You captain a British Navy Ship of The Line through enemies and upgrades.
Human Centipede: The Game!
Save the Goons Control a robot dude, block bombs and missiles with your face, and save the little guys below!
Heir Perhaps the greatest Flash based Shadow of the Colossus clone yet.
Sunburn Aim the sun's rays to keep tourists off the beach.
Larry and the Gnomes Extremely well done beat em up, very polished. Lots of secrets and addictive.
Crush the Castle 2. As awesome as the first, PLAY IT PLAY IT PLAY IT!
Beat Streak 3000 DJ Hero meets Rock Paper Scissors.
Morphlee Morplee is a series of Wariowareish minigames that you are charged with beating in a certain time limit. While also making sure aliens don't reach the bottom of the screen.
Zombies took my Daughter Shoot zombies and/or hit them with wrenches, save your daughter.
Achievement Unlocked 2. Hell. Yes.
Dino Strike A beat em up that is reminiscent of Streets of Rage.
Isora and Muku Fly around and protect a brown bear-thing by beating up incoming stone monsters. (A tip, try to smash the animal statues you see along the way, they give you continues)
Epic Combo. Hit turtles with a hammer, get money, buy stuff, and hit them again!
Robot Wants Fishy 3 Help guide Robot to the Fishy he so desperately wants.
Road of the Dead Escape the quarantined city by driving through a highway filled with ravenous undead, carnage and chaos while the military tries to stop you.
MOBY DICK: THE VIDEO GAME You're Moby Dick. Eat everything. Sink ships by slapping them with your tail or jumping on them from above.
Haunt the House Halloween-themed game. It's not hard but it's scaaaaaaaaaary!
Garden Gnome Carnage Lets you play as an angry Christmas-hating garden gnome suspended from a building by a bungie cord and hurl bricks at elves.
Drop Dead 2 Toss the ragdoll around and deal as much damage to it as possible. Complete with gibs and flying body parts!
Love Love is a unique and addictive high-score game where you risk getting hurt to gather happiness.
Bubble Tanks 3 You are a bubble tank fighting other bubble tanks and collecting bubbles, all within an even larger bubblefield.
Effing Meteors Really awesome game about launching meteors to extinct the planet.
Super Goblin War Machine Use your you Goblin War Machine to kill humans. Get money and build better war machines. Kill more humans.
Viva Caligula! in Hell Battle Hitler, Stalin and other evil dudes to take your rightful place amongst history's foulest leaders.
Elephant Quest Explore the freeform world of 45 various areas in this RPG-Shooter hybrid.
Fitted You move your little ship through the scrolling maze with the mouse, and control the speed of the scroll and also the size of your ship with the arrow/wasd keys. You can unlock items to help you gather points and stuff more easily.
Roadkill Revenge Cause horrific chain reactions by crashing your car into traffic
Space Is Key A well-executed, challenging and, most importantly, fun one-button game.
1916 - Der Unbekannte Krieg Requires Unity player. Grab what you can and head for the nearest ladder
Multitask 2 Dope mini games where you have to keep track of several things at once.
Chisel Use your amazing drill bonce to cut planets down to a suitable size before jetting off to the next one to economize its surface area as well.
Power Devour! "Made for the 4th Game Jam where everyone was given a handicap. Our's: Make the player character fill up 75% of the screen."
Cat Gets 100 Stars Sort of like Achievement Unlocked with the elephant, except it isn't as entertaining or difficult and takes like 5 minutes.
Going Up Solid vertical platformer, stuff to upgrade.
The Lance Simple little jousting game, click rapidly to speed up then aim at their dome. Upgrades and that jazz.
Run From the Sun You're a spaceship on spinning planets and you click and it will hop from one to the next.
Penguin Overlords Collect money as your penguins do their thing and kill turtles and upgrade them so they can kill more turtles.
Cat God vs Sun King This one involves using upgradeable godly smiting powers to prevent a rival god's minions from erecting a temple in his honor.
Accelerator Here's a fun little rail-platformer. It makes the game a lot more fun if you start to slowly scream once the pace picks up.
Accelerator Updated to let you start at the highest multiple of 100 speed you've attained.
Knight Age Jousting game.
Gingerbread Circus 3 Short mouse aiming game.
Chase Goose Run along while you press buttons it tells you to jump. Gets a little difficult, and will probably give you carpal tunnel.
Fish Diver Go underwater, shoot abstract fish, get money for upgrades. It's a very chill and yet vaguely creepy game at the same time. Plus you can make ridiculously huge numbers happen.
Spiral Knights The Spiral Knights have awoken on an alien world.
Pole Riders Fun polevolting game.
Moby Dick 2 More enemies and an upgrade system, overall a pretty solid sequel. A good way to waste an hour or two.
Tasty Planet: DinoTime It's like Fishy if you were a ball of goo instead of a fish and all the larger fish were everything else in the universe.
Pinata Hunter Simple upgrade game, where you beat the fuck out of a pinata. The whole thing takes about 15 minutes.
TU-46 "A fucking flight simulator what the fuck do I do." "This is a torture device wrapped up in game form."
Chigam 9 :nws: You shoot fingers up someone's butt as they try and poop on you.
Versus Umbra From the maker of Madness Deathwish, Madness Deathwish 2, and The Final Deathwish
Superfighters Like a cross between an action movie and Super Smash Brothers.
SCGMD4 Guitar hero type game, quite good fun. Adds a new dynamic with two hands going at once, it's more like sight-reading piano. Has "bosses" as well, that do stuff like switching round the rows the hits come in and messing with your head.
DOLPHIN DASH It's kinda like Aggressive Alpine Skiing, except on LSD. Seriously though, do not play this if you have epilepsy. It will most likely kill you.
Defend Your Trump Action game where you protect Trump's billions from bots and burglars.
Amorphous+ A survival game with RPG elements where you're a dude with a big sword and a lot of slimes. Addictive as Hell.
Bank Run NWS for language and violence. Remember that Survive the Outbreak interactive zombie movie? They made another game a couple of years ago called Bank Run.
New York Shark was just released by Mausland. Third in the line of the insane crazy fun shark games, where you play a shark that swims around fucking everything up.
Working Stiffs Zombie action/puzzler where you help guide survivors to the exit.
Dungeon King Very pretty dungeon crawler. Those barrels are stingy as fuck though.
Kayezone It's a game about keeping Kanye West out of his zone. Kanye heads float around and you use your bumper to block them. Use arrow keys to move the "bumper".
Axon Fast-paced little flash game where you try to grow your neuron as long as possible by clicking on adjacent nodes before your neuron dies.
Madness: Project Nexus Good old Madness with more stuff to be added to it over time.
EpicSaxGame. Basically it's Guitar Hero meets Midi meets Eurovision Epic Sax Guy.
Snowball Delightful pinball game with a unique premise.
Destrocity Nice blow the fuck out of everything action game.
Super Villainy Action arena shooter with upgrades.
Tripod Attack Control your giant alien dealio to destroy the human race. With upgrades.
Dino Strike - A Streets of Rage clone, only now you punch dinosaurs in the face.
Pirateers Highly-simplified version of Sid Meier's Pirates: you don't have to worry about things like wind direction and there's no sword fighting, it's just naval combat and treasure-hunting.
Feed Us 3 Action game of making your piranha kill, with objectives and upgrades.
"It's a tab" Super-innovative action game(which requires a recent version of Firefox, Chrome or Opera).
Coffee Break Hero Only uses left click. Pretty repetitive but I played it for a while. Kind of sort of resembles Paladog.