Your right, but is is hard to hold the computer upside down. :)

Great.

Great.

Logical but took me some time to work out.

You can also hold down CTRL + ALT and press the down-button to flip the screen upside down (this works for all directions).
To flip it back simply hold CTRL + ALT again and press the Up-arrow key.

Very cool puzzle and idea, thank you.

Very good, but dificult.

Finally! After several false starts I did it!! Nice design, but tricky.

Nice design and good, difficult puzzle. Can't read it though :) Thank you.

Very good! Thanks!!

That was fun - couldn't figure out the very last bit logically though. And also not sure what it says...

Thanks.

Super puzzle.

Awesome, TRUE and FALSE, also 100% logical, well done.

Thank You.