Can You Escape Tower Level 9

You find yourself in a library with no doors. The exit is well hidden. You will need to look through books to find an answer.
Can You Escape Tower Level9 walkthrough
1. Crystal Ball: Grab the crystal ball off of the shelf.
Can You Escape Tower Level9 crystal ball
2. Book: Get a book from the shelf right above the crystal ball.
Can You Escape Tower Level9 book
3. Second Book: Grab another book from the bookshelf on the right.
Can You Escape Tower Level9 Second Book
4. Cabinet: Open cabinet door. Get a two-cylinder wooden key.
Can You Escape Tower Level9 cabinet door Can You Escape Tower Level9 two-cylinder key
5. Table: Insert two-cylinder wooden key into the center of the table. Check out the locked box under the table top. A word “APERI” is engraved at the top of the box. Take a look at the books that you obtain earlier. Look up APERI in the cipher chart made up of letters, then cross-examine with the cipher chart made up of numbers. Translate APERI to 91540. Enter password: 91540. A compartment will open. Get a scroll.
Can You Escape Tower Level9 round table Can You Escape Tower Level9 locked box

Can You Escape Tower Level9 cross examine Can You Escape Tower Level9 scroll
6. Stars: Look out the window. Use the crystal ball to absorb the star lights.
Can You Escape Tower Level9 stars
7. Puzzle: Place crystal ball on the shelf. The shelf will be illuminated. Check out a box with a panel of buttons on top. Each button is labeled with letters and numbers. Take a look at the scroll. The scroll shows which buttons to be tapped. Once you enter all the combinations, the box will open. Grab a key.
Can You Escape Tower Level9 illuminate Can You Escape Tower Level9 solve puzzle Can You Escape Tower Level9 key
8. Keyhole: Locate a keyhole at the top of the bookshelf. Insert key into the keyhole. The bookshelf will move revealing a passage. Exit the room.
Can You Escape Tower Level9 keyhole Can You Escape Tower Level9 escaped