Should used a PC

PC quicksave for the win.

Odd

...But somehow entertaining...

lol

I can turn my head around

Not really historically accurate...

But still fun. Just a little background: Nickolas Tesla was Croatian, which, at the time of WWI, was a part of Austria, which was Germany's ally. Besides, Tesla was a U.S. citizen long before WWI started and died before the end of WWII. But the game still entertained me, so I guess its not really a big deal.
And also, @ Narhethi, You do know the game ends after day 20, right?

Too easy

There should be some sort of limit or penalty for using the hint button. Otherwise, you can just mash it until the whole thing is solved.other than that, it was good.

Nice Idea

It may just be because I suck, but a lot of the pars seem a little unrealistic. Then again, that may just be because I suck. But other than that, nice graphics, and i didn't encounter any bugs.