Noobish Does Not Exist in the current context

by

Your creation of the button is scoped within startnewgame() and is not accessible to method GamePanelHideButtonClick

Move the GamePanelHideButton variable outside of both methods.

Try this 

public Button GamePanelHideButton;

public void StartNewGame()
{
    GamePanelHideButton = new Button();
}

public void GamePanelHideButtonClick()
{
    GamePanelHideButton.Visible = !GamePanelHideButton.visible;
}

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