If you are free...

Go to www.arcadetown.com and download some free trial games(valid for a hour) to play.
Some of them are pretty addictive and we usually do it when we arent heading out for lunch.
I dislike using my home pc to download cos' it's taking forever.

Although it's a hour but I think for some games, you can play more than that 1 hour limit as long as you dont quit and play it at one shot.

One such game is Carl the Caveman.

You can find it under the arcade link.

A total of 50 levels and I can only complete it at home.

It's cute but not that easy afterall. Requires a lil' of brain work which is good.

Warning:
You need ALOT of patience in playing this game. You cant quit if you wanna complete the 50 rounds without having to purchase that game. (Note: Like I said, if you wanna overuse that one hour of free trial, you gotta do it onthe expense of your energy. Do it a one shot.)
Too much haste and occasion frustrations would lead you to nowhere.

Tips:
If you find yourself stuck and couldnt figure a way out temporary, you could go to use the solution. It will automatically show you the way and you will realised it's not that tough afterall.(which will too makes you think are you stupid or stupid.)

Help:
Use you arrows keys to move.
Spacebar is to hit.(it only works on rocks not monsters.)

Smile:
Cute anime. Activate your brain. Got solution. And even if you die, you could replay at the last level you died.

Enjoy.