I have found two interesting website off the internet that will challenge your mind and put your skills to test.
For beginners, feel free to go to
Here is a screen shot of what you will be expecting.
There are walk through available online but it is better if you try it out by your own first. In this game, there are hints that will guide you through the levels (or webpages). You just need to follow them and ta-dah, you are in the next level.
FOR EXPERTS, go
Beware not to blow your mind. If you think you can't get through the first few levels I suggest you try out the first one up there.
The screen shot:
This is harder compared to the previous riddle. If you find the previous game not challenging, try this out.
WARNING: If you are having test tomorrow, DO NOT play it. You WILL get addicted.
Now go surf those pages and have fun. ^^