Thanks for your great comment!
Let me explain the issue:
In the second game, the arrow moves according to people's bet (it tries to make people win). And the more gap, the more arrow moves. So you need to keep it in the middle as much as possible. I know it's a little hard, I actually wanted to add a third game but couldn't make it in the time, so I made it a little bit harder than it should be. Otherwise, the game won't end. But if I continue making this game, I will certainly consider your feedback :)