How do I compare values and if not equals pick highest?

I need to check the values of the same variable in the 25 instances and get the instance that have the highest value if it is unique or request that the user changes the equal values. I believe I will need to use the "Sprite>Pick highest" event but I don't know how to build it.

I'd create a Function that fills an Array with all the values your looking at and then pick the highest value in the array.

Local variable TheHighest

Sprite>Pick highest

_____Set highest to the highest instance value

Sub ____ System > pick all

_________ Sprite > Compare instance variable =? TheHighest

_________System > compare 2 values ... Sprite.PickedCount =? 1

___________________actions run if there is only 1 TheHighest

_________Else

___________________actions run if there is more then 1 TheHighest

Local variable TheHighest

Sprite>Pick highest

_____Set highest to the highest instance value

Sub ____ System > pick all

_________ Sprite > Compare instance variable =? TheHighest

_________System > compare 2 values ... Sprite.PickedCount =? 1

___________________actions run if there is only 1 TheHighest

_________Else

___________________actions run if there is more then 1 TheHighest

I was doing something like that but I forgot to include the "compare 2 values" condition in the same event of the two others. Thank you.