GRIDGAME

For a diversion that looks a lot easier than it is, go to
This site The game shows a
grid that is filled with curved lines - click on one and it turns. Any line
the turning line touches will start to turn, setting off a chain reaction.
Easy to play, and fun to watch.

Battle for Wesnoth

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The Battle for Wesnoth is a turn-based strategy game with a fantasy theme. It offers several campaigns, the first of which is 'The Heir to the Throne'. After ages of peace and prosperity the lands of Wesnoth have been overrun by hordes of Orcs and Undead. As the rightful heir to the throne of Wesnoth, you must gather a troupe of loyal adventurers to reclaim your throne. In a sequence of missions you must lead them wisely to help them gain experience and riches. In other campaigns you can play as other races, such as Elves, Dwarves, Orcs or Undead.

Launch your trebuchet

Will you increase the mass of the counterweight? Maybe you ought to fiddle with the launch angle. Those are two of six adjustments to make when playing the harder-than-it-looks Treb Challenge. (Okay, I didn't know what a trebuchet was either.)

Foonbox Arcade

Great independant games site from the makers of Hapland.
Eat In
Escape from Rhetundo Island
Avoision
Hapland
Hapland 2
The Pie Game
The Balls Game

Take Away
Blackshift
MindWinder

Sudoku online play

Fill in the grid so every column, row, and 3x3 grid contains all digits 1-9 only once.
Great online version of the game. Hint--Hold down the number button before placing it into the location.

Killer Flash Games

Here is the Crimson Room, a Flash game I found baffling:

and IF you manage to complete that game then try the next one called Viridian Room

Note
If you go insane trying to figure out how to escape the crimson room, you're not alone.you will find hints HERE. Very clever puzzle.

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When your done with those two puzzles then try these two
Hapland 1:
It's a little easier as there are only 25 items to click as opposed to
Hapland 2's 48.

Let me know how you get on