I like the 2/3d graphics, but sadly I couldn't finish the first puzzle because I couldn't reach the fourth sign :I
Viewing post in Handy Talker jam comments
There are open books on the bookshelf next to the keypad, they have symbols on them like a dot, | , ; and C, then there are 4 bookshelves scattered around that tell you what these symbols correspond to and you just insert the numbers that correspond to the signs on the books as the code, then you can reach the fourth sign!