Bloxorz
 

All you need to do is plop the block in the hole.

You have 33 stages to complete in Bloxorz -- and nine short pages of instructions.

http://www.bloxorzgame.com/

My one hint - when you get to a new stage, write down the pass code so you can return to that stage without having to do all of the stages again.

Z

Addictive...thanks zcaveman.