The multiplier is free lol

https://s.castle.xyz/uawTvVe20-

For the shop you can do When this is tapped If the $taps is equal or greater than (number) Modify $taps -(number) (relative) Modify $multiplier (number) (relative) If you don't know this yet :D

Try When this is tapped Modify $taps to $multiplier (relative) The multiplier variable should be set on setting with persistent with the initial of 1 and taps should be like that but 0 initial :)

And I also tried to make shop

It's hard so I'm gonna leave it like this for now