100 Doors Remix Level 16 Walkthrough: Drag the hammer to the door of the furnace, then tap it to lock it in place. Drag the wood inside, then the paper (FDH), then the lighter. Close the door and wait until the temperature rises to the maximum.
100 Doors Remix Level 17 Walkthrough: Tap the light switch and count the card suites on the bottom left: 7, 9, 3, 4. Turn on the lights and enter the number 7934 above the door. Take the ring from the box and drag it to the white block to put it in. Drag the left rope hanging from the ceiling and connect the hook with the ring in the white block. Drag the safe to the right so it's under the weight on the right. Tap the hook and ring on the left rope to let it go. Take the key from the safe and use it on the keyhole.
100 Doors Remix Level 18 Walkthrough: Use the stick+hook to get the hook in the water. Drag the new hook to the stick+hook to make it have 2 hooks. Drag the 2 hook + stick to right on top of the box. Drag the two balloons to both hooks so the box floats up and drains the room.
100 Doors Remix Level 19 Walkthrough: Swipe up and down repeatedly on the fan to make it spin until the door is fully open.
100 Doors Remix Level 20 Walkthrough: Shake your phone to make the two fruits fall. Tilt your phone to the left and another fruit will roll out. Take them and the white paper in the bucket. Drag the 3 fruits into the bucket. Take the screwdriver and use it on the square door next to the tree. Pick up the bolt that fell off. Open the door and take the lever. Drag the lever to the section on the pipe on the left that has a hole. Place the bolt on it, then tap the lever to pull it. Drag the lighter to the top of the pipes to light the gas coming out. Drag the paper to the flame to see the clue 374, then once you remember the clue, drag the paper into the fire again. Change the numbers above the door to 374, then drag the door to the right.