This is a block that allows you to make a slider, and use it. The instructions are inside. If you like this project don't forget to love and favorite it.
Thanks to @TheKingRafael and @codeman1044 for help with the script. Also, thanks to @Ryken_1337 for the inspiration to make this. Click this link to check out his slider https://scratch.mit.edu/projects/311599371/ If you use the block make sure to give me credit.