Floor 75 on 100 floor is an another easy floor that players will find themselves breezing through. When you begin the stage you will see two weights on both sides (uneven of course). There are some metal weights on the ground (3 to be exact). To beat 100 floors’s floor 75 you need to place all three silver weights on the ground on the right side which will tip the scale the other way.
Once you do this bring the small weight that was originally on the right scale to the left and it will balance out like below. Doing this will unlock the first green lights then tilt your device 180 degrees or upside down and it should unlock the second green lights allowing you to unlock the door on floor 75 in 100 floors app.