diff --git a/data-with-overlays/challenging/bounds.json b/data-with-overlays/challenging/bounds.json
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+++ b/data-with-overlays/challenging/bounds.json
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+{
+	"xMin": 31744,
+	"xMax": 34048,
+	"yMin": 30976,
+	"yMax": 32768,
+	"zMin": 0,
+	"zMax": 15,
+	"width": 2560,
+	"height": 2048,
+	"floorIDs": [
+		"00",
+		"01",
+		"02",
+		"03",
+		"04",
+		"05",
+		"06",
+		"07",
+		"08",
+		"09",
+		"10",
+		"11",
+		"12",
+		"13",
+		"14",
+		"15"
+	]
+}
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diff --git a/scripts/apply-overlay.sh b/scripts/apply-overlay.sh
new file mode 100755
index 000000000..dff6b0c95
--- /dev/null
+++ b/scripts/apply-overlay.sh
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+#!/usr/bin/env bash
+
+# Navigate to the root of the repository.
+cd "$(dirname "${BASH_SOURCE}")/..";
+
+# Ensure `tibia-maps` is in the PATH on CI.
+PATH="${PATH}:$(pwd)/node_modules/.bin";
+
+if [ -z "${1}" ]; then
+	echo 'No argument supplied. Example usage:';
+	echo '';
+	echo 'scripts/apply-overlay.sh challenging';
+	exit 0;
+fi;
+
+if [ 'challenging' != "${1}" ]; then
+	echo "Invalid argument. Try 'challenging'.";
+	exit 0;
+fi;
+
+overlayID="${1}";
+for floorID in 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15; do
+	echo "Processing ${floorID}...";
+	input_path="./data/floor-${floorID}-map.png";
+	overlay_path="./overlays/${overlayID}/floor-${floorID}.png";
+	mkdir -p "./data-with-overlays/${overlayID}";
+	output_path="./data-with-overlays/${overlayID}/floor-${floorID}-map.png";
+	if [ -f "${overlay_path}" ]; then
+		magick "${input_path}" \
+			\( -clone 0 -fill black -colorize 60% \) \
+			-compose over -gravity center -composite \
+			"${overlay_path}" -gravity center -compose over -composite \
+			"${output_path}";
+	else
+		# No overlay image; only apply the darkening.
+		magick "${input_path}" \
+			\( -clone 0 -fill black -colorize 60% \) \
+			-compose over -gravity center -composite \
+			"${output_path}";
+	fi;
+done;
+cp ./data/bounds.json "./data-with-overlays/${overlayID}/bounds.json";