Winterbells

Use the mouse to move the bunny rabbit left and right, and click the button to make it jump. Bounce off the bells to climb higher and higher in the sky, scoring more points for each bell, and doubling your score for bouncing off birds. Eventually you'll fall, but don't worry he always has a soft landing.

 

Acrobots

A weird flash thing with no real point, but lots of fun to play around with. Move or throw the acrobots around and watch them climb on, and stick to each other. Add more with the plus button, turn on the light, change the energeticness of the acrobots, or even more impressively rotate the whole box and watch them tumble over each other. Bizarre, but strangely satisfying.
 

Penguin Pushing Game

Here's a game where you need to position arrows on the ground to get the penguin to his deckchair. Really quite challenging after a while, but makes for some interesting problems.

Oh, did I mention it's all in German? Still, you can probably work out what the gist of it means!
 

SuPuzzle

Connect the three houses to the three utilities without any of the pipes crossing. This is a classic puzzle written in flash, and it is possible. You will probably think that you've tried everything, but there is a fairly elusive solution to find.

 

Boomshine

In this game you have to set off a chain reaction of exploding circles by clicking the mouse. There are twelve levels which get progressively harder, and I didn't manage to complete the last one. However as the levels get higher it also seems to me that whether you succeed or not is more based on luck than skill. Anyone want to prove me wrong?

And I almost forgot to mention - the music to this is great (although a bit repetitive).

Crazy Cube

If I'm honest I was slightly disappointed by the lack of craziness in this game. It did however contain a high cube content rating, so if you're adverse to cubes then turn away now.

Click and drag to connect coloured squares together on the surface of this cube. Once all the paths are connected you can go onto the next level. There are thirty levels in all, some of which are very tough.

Crazy Doors of Rainbow Colours

First of all ask yourself - how could you not play a game with this title? Some crazy doors? Complete with rainbow colours? Sounds like a great place to be.

You have to find objects, throw them against the correct walls to make doors, open the doors, and repeat! You never need to reset (although you might need to if you can't remember things), which makes this a fairly straightfoward game. However it's not an easy game, which makes it fairly satisfying too.

Dwarf Complete

This is a bit of a weird game, by the maker of the Grow and Tontie games. In this game you have to explore around and collect all the weapon/clothes/shoes things which unlock the passages into the next rooms. You also have to get the other objects which allow you to do super-cool things. Yes, super-cool is a real phrase.

I'll put some helpful hints in the comments section (otherwise it's impossible).