Creating a Clone mask using an image

[rich2005]

This is a bit of a guess as to the part(s) of the image you want to mask.

I am not into games but this looks like "toggle visibility of layers to change the setup"

Maybe one way:

Think the part of the image is this: https://i.imgur.com/MUvNOKH.jpg It is included in 3 of the layers, I would carefully select it, Edit -> Copy then Edit -> Paste-as -> New Layer in Place avoids that floating selection.

Select the background (fuzzy select works), There is no anti-aliasing in the graphic, turn that off in the tool options, Use the selection options to add the black area. When complete invert the selection. https://i.imgur.com/1gQyUtl.jpg

Layer -> Mask -> Add layer mask and use the Selection option. https://i.imgur.com/xTlsX9D.jpg Turn the selection off. Select -> None

Click in the layer icon and paint the new colours (or with the clone tool or with clipboard brush from a copies area) in the canvas. https://i.imgur.com/5Ms0Jwi.jpg

If that is the wrong area, give us a clue post a screenshot circling the part of concern.