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How do you remove cured tile adhesive?

We removed the tiles from the floor. All that's left is the tile adhesive (see pictures). I can't get very far with a 7 cm wide chisel because the glue is very stubborn and won't come off. The glue is about 3-4 mm high and spreads over an area of 70 square meters. After that, 60 square meters of parquet and 8 square meters of tiles need to be glued.

What would you recommend? 

• remove tile adhesive