Dooors2 level 41 : You need to sort nation flags base on number of people population, from left to right the order is Italy, France, USA, and China. to open the door, tilt your device to left
Dooors2 level 42 : follow image clue on board, you just need swipe your finger base on circle path arround the door( repeat this step until door open)
Dooors2 level 43 : Pick up the basket from the floor, revealing a button. Push the button to change the lamp to a UV light. Tilt your device to the right and the left to reveal hidden symbols. Change the symbols below the respective hidden drawings to open the door.
Dooors2 level 44 : Notice the image on the wall, as well as the bend in each floor lamp. These are arrows pointing to the left, and the image tells you to use one finger. Swipe to the left to move to another image of two fingers, and an identical set of floor lamps. Use two fingers to swipe left to move on. Use three fingers on the next wall to swipe left one more time to come to a door.
Dooors2 level 45 : Notice the diagonal lines above the door forming an X-like shape. Tap on the switches on the wall so that the circles recreate the image if you were to connect the dots. This causes a small firecracker rocket to come up out of the floor. Now watch the moving light above you carefully. Use your matches to light the firecracker, causing it to shoot upwards after a short delay. Hit the moving light with the firecracker twice to unlock the door.