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Online challenging Games
Mahjongg Free Game

Plays: 4416
Category: BoardGame Games
Mahjongg Free features 10 challenging levels with isometric graphics. The pieces are cube-shaped and look very different from the original Mahjong tiles. FruitJong fans will love this game as well. Beat the game and make the highest score!
Torque Game

Plays: 4404
Category: Puzzles Games
A tricky game with an easy goal: Put the ball into the exit gate in the quickest time possible. Collect power ups to help you attain this goal. With 360 degrees of possibilities the game can be quite challenging.
Doll Deco Game

Plays: 4399
Category: Other Games
What is your dream home style? Let goes your imagination because this game offers a wide variety of decoration items. There is a challenging part where you have to reproduce a model. Click on the hint button.
Gravqx Game

Plays: 4387
Category: Adventure Games
Gravqx is a challenging skill game where players have to guide a ship around a set of tunnels with the mouse in as fast a time as possible, while working with and against the forces of gravity.
Flash Nethack Game

Plays: 4380
Category: Adventure Games
A classic dungeon crawler. Unlike other games the emphasis in NetHack is on discovering the detail of the dungeon and not simply killing everything in sight – in fact, killing everything in sight is a good way to die quickly. NetHack is a very deep and very fun game but also very, very challenging
Korrode Game

Plays: 4372
Category: Action Games
Race your rust spot around each level to corrode all the bolts in this challenging puzzle and skills game! There are 32 different levels across 4 difficulty groups to try and complete at the best rating possible. Watch other player's replays of each level and race against their ghosts to better your times!
Avoidster Game

Plays: 4358
Category: Action Games
Avoid everything in this colorful avoiding game! YAY! Remember to stay away from the sides of the screen whenever possible to avoid getting hit. :)
3D Quick Pool Game

Plays: 4352
Category: Sports Games
Test your skill and accuracy on a small pool table and pot all your balls into the hole in this challenging mini 3D pool game
Burning Balls Game

Plays: 4348
Category: Action Games
Its a challenging arcade game where you can make circles using a brush. You need to escape from burning balls, which may destroy your circle and/or brush.
60 Seconds Invasion Game

Plays: 4341
Category: Shooting Games
Challenging space invaders with a 60 second limit.
Ovum Defender: Tower Defense Game

Plays: 4337
Category: Shooting Games
Simply prevent the sperm to reach their goal by set up as many gun as you can. Features: 4 challenging levels, Total 90 waves to complete, 16 different types of enemies, 12 type of guns
Chirality Game

Plays: 4320
Category: Action Games
Chirality is special challenging game. You have to combine your manoveuring and multitasking skills to avoid or destroy all the redz.
Alien Marauder Game

Plays: 4315
Category: Action Games
Play from a choice of two alien marauders, Brimstone or virago and battle through multiple levels to find their human informer, Charlie, only to discover a darker secret. Reveal a sci-fi story of two battle- hardened aliens, who fight against the evils of humanity, that wish to use their own planets' advance technology to destroy their kind! Traverse across terrain filled with challenging obstacles with in-depth shooting system that allows strategy and approach to enemies by jumping to higher or lower platforms. Discover a vast array of weapons Handgun, Laser gun, Rifles, Revolver, Grenades, Rocket Launchers, and RPGs
Liriluck Game

Plays: 4298
Category: Action Games
Navigate the space-ball through 25 challenging levels. You have to collect all coins in order to complete a level!
Defuse Game

Plays: 4287
Category: Puzzles Games
Plot: Defuse is about an ordinary person who runs accross an advertisment for FREE FOOD. After answering the solicitation, he finds himself in the somewhat malevolent environment of an ambigious research centre. Now he must use his wits to solve challenging puzzles, escape death and possibly complain to the ethics commitee that approved this project. Remember, assuming you complete this test, there will be drinks and light refreshments. good luck. Game mechanics: Defuse is a puzzle game that tests your ability to use logic and reasoning. Solving the puzzles is a two front battle as you must infer the nature of each puzzle and then find the solution (see the directions). In every puzzle, the objective is to light the disarm light without lighting the explode light. All the puzzles consist of buttons and lights related by some pattern.
Assault Day Game

Plays: 4275
Category: Action Games
Kill all the enemies in each level. As the game progresses more weapons become available and you will encounter more challenging enemies.
The Cell 2 Game

Plays: 4265
Category: Puzzles Games
Escape a room with no doors or windows. More challenging than the previous game!
Flip It (Facebook) Game

Plays: 4258
Category: BoardGame Games
Flip all the stones to the other side. Come and play this challenging mind game!
Vektor Shipht Game

Plays: 4252
Category: Other Games
Vektor Shipht is a mouse-avoider game which uses cumulative intertial movement to swing a spike and pop bubbles. Movement not only keeps you safe from bubbles, but it also controls the movement of the spike at the same time, creating a challenging game.
Battle Raven Game

Plays: 4224
Category: Shooting Games
Awesome Verical Scrolling Shootem Up where you play the role of a young space craft pilot crawling his way up in the ranks of the Ravens Mercenary organisation. The Ravens are in financial difficulty and luckily, stumbe upon the perfect money making opportunity: A once peaceful and rich intergalactic empire - the Elavinas - is deffending it's last ground against the Borgons, an iron fist ruling empire who enjoys enslaving and crushing everything in their path. The game is newbie friendly on the first few levels but later on will prove challenging even for the experts.

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Tips: Setting the opponent movement speed to zero can give you a platform for you to do your own animation instead the opponent graphic. You could make an opponent popup and then hide again using animation instead of the built in movement.