Prompt 1: Describe the central uncertainty in the game.
In the game Counting sheep? , the constantly moving box makes me unsure of victory. The goal is to move the boxes to the right, but the boxes are constantly doing an ellipse shape motion, they're hard to push in the gate and even if they're in the gate, there's a chance that they will fly out themselves. Another uncertainty comes from the lag between my controls as a player and the movement of the sheep. The sheep doesn't immediately follow my cursor, but more like dragged toward it in a fixed highest speed. So the victory requires not my own physical skills, but the correct strategy to push the boxes in the right moment. The tension feels like the thrill of hunting. I have to wait until that right moment to come, and getting that moment right is very rewarding to a player.
The source of randomness comes also from the moving boxes. They move in the same circular direction, but the track is not fixed, and the boxes collide with each other. So the movement is random, but not so random. Once the player pushed the boxes, the track will be altered as well. This also adds a little complexity in the game.