There is a bug, if you've put together the painting and change rooms, the painting will disappear, you can still click on the empty painting frame and it will open up.
Solution:
*Click on items to put them in your inventory and click on them from your inventory to use them.
*If you click the white circle in your inventory, it will return your cursor to normal.
Picture Puzzle: Place the puzzle pieces together to make the painting. After that you have to click on the painting to get what's inside the painting. There you get the green key and blue square.
How To Get(Yellow Key, Green Circle, Bat): You should click on the drawer/cabinet that is on the right side of the room, and then click on the drawers and cabinet doors and they will open, there you can get the yellow key, the green circle and the bat.
Number and Letter safes: You will also find two safes, one that requires the correct number combination and the other that requires the correct letter combination.
Next to the letter combination safe on the cabinet door, you will find some binary numbers. There is a painting that has the alphabet and next to the letters, it has the corresponding binary numbers. The code is END and if you open it, you will get the red key. The number combination can be found on a painting as well and it's 1538, if you open that safe you'll get the blue triangle.
White Door: Get the blue square from your inventory and place it accurately on the square shape on the blue lock. Do the same with the blue triangle. There you'll get the blue key and the green triangle.
How To Get(Green Square): In the room with the white door, on the left side you'll find a plant. There you'll find the green square.
Door With Yellow Lock And Ending: Now go to the door with the yellow lock and use the yellow key to unlock it. Once the second door has appeared, place the green shapes in their fitting places. Once the third door has appeared click on the bat from your inventory and then click on the door and keep clicking until the door breaks. Finally on the final door use the keys to open the locks.