How to create end level bonus score multiplier for Hyper Casual Game

Hello Guys,

I am trying to make a hyper casual game. I almost finished it but it still misses the end game bonus score multiplier. I want it to be when the player collects a specific amount of collectable items and then the player finishes the game, I want the these collectable items that the player collected to be stacked on top of each other while the player is standing on them to show the score of the player.

There is a similar feature in the ATM Rush Game. At the end of the level the player stands on the top of the money that is collected and then multiplies the current score number with score multiplier Box .

Any would help would be really appreciated it.