How to call a function on ENTER key in Excel using vba

Question

Google should provide me with ample examples but none of them seem to work

What I want: Everytime the user presses, and then releases, the ENTER key

Answer 1

^{What I want: Everytime the user presses, and then releases, the ENTER key, for my program to do do something (ie. create a MsgBox, or call function Foo).}
_{I would prefer this in the form of a MWE}

If I read this correctly, you want a blank row between every user inputted value doing down and a blank column between every user inputted value going right.

On the worksheet code sheet:

Option Explicit

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    If Target.Count > 1 Then Exit Sub
    Application.EnableEvents = False
    Dim r As Long, c As Long
    If Target.Row / 2 <> Int(Target.Row / 2) Then r = 1
    If Target.Column / 2 <> Int(Target.Column / 2) Then c = 1
    Target.Offset(r, c).Activate
    Application.EnableEvents = True
End Sub

This occurs for all navigation. If you only want this to occur on input, modify to suit a Worksheet_Change event macro instead of a Worksheet_SelectionChange event macro.