I have created a walkthourgh with some tips, hints, and explanations for the first 50 doors of the Android room escape game: 100 Doors. (If you are looking for hints or answers to the first 50 doors, go here)
Door 51. (Some call it Level 51 or Floor 51).
Hint: The numbers 1,2 and 3 are written at the top backwards. So think in reverse. There are 3 buttons on the side.
To open this door, read the numbers from right to left, and tap the corresponding button on the side (top =1, middle = 2, bottom = 3). After each set, press the red button.
To solve: top, middle, red. Middle, bottom, top, red. Top, middle, bottom, green arrow.
You need to use the pictures to generate the top 5 colors. Look at the direction of the arrow, which means the item will replace the other one.
So to get the Red, click the fire.
Green, click the banana
Yellow, click the banana again
Brown, click the coconut
White, click the coconut again.
Flags and clouds. Hint: Look at the wind direction.
To solve this one, make the flags pointing to the correct direction by looking at the clouds.
The left-hand side from top to bottom should be Left, Right, Left, Right, Left.
The right-hand side from top to bottom should be Left, Right, Left, Right, Right.
To open this door, you need to turn the 6 stars so that the red, green, blue arrows of all 6 point in the correct direction.
On the left hand side, from top to bottom:
2 reds pointing north. 2 reds pointing south. 2 reds pointing north.
On the right hand side, from top to bottom:
2 reds pointing west and north-west. 2 reds pointing west and south-west. 2 reds pointing west and north-west.
There are 3 animals FEARED by 3 other animals. Click the correct combinations to open. (the order does not matter) Cat - Dog; Snake - Eagle; Elephant - Mouse.