Room 4: The Puzzlement

You find yourself in a room with four walls, each with a different puzzle on it.

To the left wall, a sliding puzzle.

To the right wall, a riddle.

To the top wall, a cryptogram.

To the bottom wall, a cipher.

You must solve the puzzle on one wall to unlock the door.

But be warned, the puzzles are harder than they look.

Maybe there is another way out?