Any idea? It just says no documentation.

import Foundation

struct Game { var target: Int = Int.random(in: 1...100) var score: Int = 0 var round: Int = 1

func points(sliderValue) -> Int {
let difference = abs(target - sliderValue)

    // or difference*= -1
    // or difference = -difference
    let awardedPoints = 100 - difference
    return awardedPoints
}

}

difference is an int but its not showing up like this

You need to finish the function signature. Swift doesn't know what type sliderValue is. I'm guessing that should be an Int too?

(i.e. func points(sliderValue: Int) -> Int {)

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