Instead of the first '+' symbol use an 'x' symbol. Instead of the first '-' symbol use a '+' symbol. Click on the Numpad and enter 64 to open the door.
100 Doors Brain Teasers Level 16 17 18 19 20
100 Doors Brain Teasers Level 17 Walkthrough
Click on the table to take the paper with a hint. Click the Numpad and enter 3 to open the door
100 Doors Brain Teasers Level 18 Guide
Click the cupboard and then the key inside to move the key to the vault. Click the cupboard again to open the other side of the cupboard and click the bottle of oil to bring it to the vault. Select the bottle of oil and click on the door lock. Now click the key and then door to open it
100 Doors Brain Teasers Level 19 Solution
Click the numpad and enter 11 (the next prime number in sequence) to open100 Doors Brain Teasers Level 20 Walkthrough
Click the painting above the door to make it fall on the floor. Click the screen next to the door and enter the following color sequence: Top Box: Red, Bottom Box: Brown, Left Box: Blue and Right Box: Green.
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