This was the one but as @Bobbo says reach may be an issue depending on how liberal the tiler was with adhesive: https://youtu.be/VDlEd-6HoGU?t=63
Have used a multitool to do just that. Loose plaster will come away from the wall too.
My tip is if the tiles are small, get a blade the length of the tile.
@lynx started
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This was the one but as @Bobbo says reach may be an issue depending on how liberal the tiler was with adhesive: https://youtu.be/VDlEd-6HoGU?t=63