First you will need:
ruined wood chisel about 1 inch wide
pound out one tile by hitting it hard, once you get out one just start with the chisel working your way around. Very easily to remove once that first one is gone. The grout will come off with the tile.
Again, becareful about your eyes and hands. Some of the glaze on the tile is sharp as a razor blade. Pick up piles of broken tile with a dust pan only. Do not step on the bag to compact it and do not take the glasses off when moving any broken tile.