If you enjoy 'slide the block' type puzzles, you might enjoy sokoban! It's been around for years, and many freeware versions are available for download, as well as online play versions.
Just type 'sokoban' into your favorite search engine and see what you come up with. Sokomind is excellent, and others are out there as well.
Here's a link I just found for playing online:
(If you check out this page, the object is to use your arrow keys to move the little guy around and push the boxes onto the designated spaces marked with an x. You can only push, and only one box at a time, so be careful where you push the boxes.)
Here is a link to sokomind, which is freeware and can be downloaded and installed on your computer:
If you get addicted and it drives you crazy, I apologize!