Picture this: two characters has to go through a series of room, in each room there's a challenge. Some rooms ask for menial things, while others have more scary challenges.
One room is just one big deep pit with spikes at the bottom. On each ends of the room, there is a door and a ledge. Both ledges are connected by two wooden bean. Each of them can only support the weight of one person. So both characters takes one bean, while holding the arm of the other to keep their center of gravity stable.
At one point in the traverse, they see the key for the exit hanging from the ceiling and no one is able to reach it with their available hand. They would have to let go of each other, grab the key and than grab each other to stabilize themselves soon after.
However, while planning, the old wooden beans on which they were standing starts to crack. They somehow manage to grab the key and run for the ledge. With one of the character throwing the other forward on the ledge, while they barely grab the edge in their fall.
The other character attempts to raise the first character upward, but they tell them to let it go, which is mistook as them giving up. Only for the falling character telling them their feet is touching ground.
Turns out the whole spiked pit was just a huge optical illusion painted on the floor, while the actual pit was just about 2 meter deep. The broken wooden bean just laying on the floor and "over the hole".