One of the most popular puzzle games ever played was Tetris and this game is still being built on the latest games systems but with much improved sound and graphics.
This is N-Blox which is very similar to Tetris, although it is not endorsed or affiliated with the copyright owners of Tetris®.
All the same it is a great free flash game that you can play online for hours and still not get bored, but remember to have a break at least every couple of hours as it can get addictive.
The Controls Are:
Down arrow – Drop shape faster
Right arrow – Move shape right
Left arrow – Move shape left
X – Rotate clockwise
Z – Rotate counter-clockwise
M – Mute/unmute sound
Q – Quit game
P – Pause/unpause game

Have fun and enjoy this free online game, just click the photo or start link below to play.
Start the Free Game of N-Blox