diff --git a/themes/slate-es-de/MISSING.md b/themes/slate-es-de/MISSING.md
index afb748c17..dfe231a4e 100644
--- a/themes/slate-es-de/MISSING.md
+++ b/themes/slate-es-de/MISSING.md
@@ -39,6 +39,7 @@
 * flash: Adobe Flash - consolegame.svg, controller.svg
 * fmtowns: Fujitsu FM Towns - consolegame.svg, controller.svg
 * gamecom: Tiger Electronics Game.com - consolegame.svg
+* gmaster: Hartung Game Master - consolegame.svg
 * gx4000: Amstrad GX4000 - consolegame.svg, controller.svg
 * intellivision: Intellivision - consolegame.svg, controller.svg
 * j2me: Java 2 Micro Edition (J2ME) - consolegame.svg, controller.svg
diff --git a/themes/slate-es-de/gmaster/colors.xml b/themes/slate-es-de/gmaster/colors.xml
new file mode 100644
index 000000000..65bcdff09
--- /dev/null
+++ b/themes/slate-es-de/gmaster/colors.xml
@@ -0,0 +1,16 @@
+<theme>
+    <view name="system, gamelist">
+        <image name="band1">
+            <color>1E1D1D</color>
+        </image>
+        <image name="band2">
+            <color>FF0000</color>
+        </image>
+        <image name="band3">
+            <color>7F888D</color>
+        </image>
+        <image name="band4">
+            <color>945336</color>
+        </image>
+    </view>
+</theme>
\ No newline at end of file
diff --git a/themes/slate-es-de/gmaster/images/logo.svg b/themes/slate-es-de/gmaster/images/logo.svg
new file mode 100644
index 000000000..c554ae7e2
--- /dev/null
+++ b/themes/slate-es-de/gmaster/images/logo.svg
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 26.0.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 3840 715" style="enable-background:new 0 0 3840 715;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FF0000;}
+</style>
+<g>
+	<g>
+		<rect x="180.7" y="423.5" class="st0" width="226.4" height="106.9"/>
+		<g>
+			<rect x="671.4" y="398.3" class="st0" width="106.9" height="310.1"/>
+			<path class="st0" d="M778.3,398.3c-35.6,0-71.3,0-106.9,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-71.3,0-106.9,0
+				C494.7,209.3,778.3,209.3,778.3,398.3z"/>
+			<rect x="494.7" y="398.3" class="st0" width="106.9" height="310.1"/>
+			<rect x="508.7" y="477" class="st0" width="260.1" height="106.9"/>
+		</g>
+		<g>
+			<rect x="2990.3" y="327.4" class="st0" width="106.9" height="381"/>
+			<rect x="2921.4" y="256.6" class="st0" width="244.6" height="106.9"/>
+		</g>
+		<g>
+			<rect x="2417.1" y="398.3" class="st0" width="106.9" height="310.1"/>
+			<path class="st0" d="M2524,398.3c-35.6,0-71.3,0-106.9,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-71.3,0-106.9,0
+				C2240.5,209.3,2524,209.3,2524,398.3z"/>
+			<rect x="2240.5" y="398.3" class="st0" width="106.9" height="310.1"/>
+			<rect x="2254.5" y="477" class="st0" width="260.1" height="106.9"/>
+		</g>
+		<g>
+			<rect x="1008.1" y="393.7" class="st0" width="106.9" height="314.7"/>
+			<rect x="831.5" y="393.7" class="st0" width="106.9" height="314.7"/>
+			<path class="st0" d="M1061.6,398.3c-35.6,0-17.8,0-53.5,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-71.3,0-106.9,0
+				C831.5,209.3,1061.6,209.3,1061.6,398.3z"/>
+			<path class="st0" d="M1291.7,398.3c-35.6,0-71.3,0-106.9,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-17.8,0-53.5,0
+				C1061.6,209.3,1291.7,209.3,1291.7,398.3z"/>
+			<rect x="1184.8" y="393.7" class="st0" width="106.9" height="314.7"/>
+		</g>
+		<g>
+			<rect x="1903.7" y="393.7" class="st0" width="106.9" height="314.7"/>
+			<rect x="1727" y="393.7" class="st0" width="106.9" height="314.7"/>
+			<path class="st0" d="M1957.2,398.3c-35.6,0-17.8,0-53.5,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-71.3,0-106.9,0
+				C1727,209.3,1957.2,209.3,1957.2,398.3z"/>
+			<path class="st0" d="M2187.3,398.3c-35.6,0-71.3,0-106.9,0c0-46.5-69.7-46.5-69.7,0c-35.6,0-17.8,0-53.5,0
+				C1957.2,209.3,2187.3,209.3,2187.3,398.3z"/>
+			<rect x="2080.3" y="393.7" class="st0" width="106.9" height="314.7"/>
+		</g>
+		<g>
+			<rect x="1376.3" y="429.1" class="st0" width="192.8" height="106.9"/>
+			<g>
+				<rect x="1376.3" y="256.6" class="st0" width="192.8" height="106.9"/>
+				<path class="st0" d="M1451.8,601.5v-345h-106.9v365.7c0,47.6,38.6,86.2,86.2,86.2h138V601.5H1451.8z"/>
+			</g>
+		</g>
+		<g>
+			<g>
+				<rect x="3238" y="429" class="st0" width="192.8" height="106.9"/>
+				<g>
+					<rect x="3238.1" y="256.5" class="st0" width="192.8" height="106.9"/>
+					<path class="st0" d="M3313.6,601.5v-345h-106.9v365.7c0,47.6,38.6,86.2,86.2,86.2h138V601.5H3313.6z"/>
+				</g>
+			</g>
+			<g>
+				<rect x="3484.1" y="413" class="st0" width="106.9" height="295.4"/>
+				<polygon class="st0" points="3697.6,511.6 3675,534.3 3591,468.5 3622.1,587.2 3749.9,715 3825.5,639.4 				"/>
+				<path class="st0" d="M3662,235c-98.3,0-178,79.7-178,178c0,73,44,135.7,106.9,163.1V468.5l30.8,117.7c13,3,26.4,4.7,40.2,4.7
+					c98.3,0,178-79.7,178-178C3840,314.7,3760.3,235,3662,235z M3662,484.1c-39.2,0-71.1-31.8-71.1-71.1c0-39.2,31.8-71.1,71.1-71.1
+					s71.1,31.8,71.1,71.1S3701.3,484.1,3662,484.1z"/>
+			</g>
+		</g>
+		<path class="st0" d="M2880.8,256.6h-62.9l0,0c-62.5,0-115.9,45.2-126.1,106.9l-32.9,198.3c-3.8,22.9-23.6,39.8-46.9,39.8h-47.4
+			v106.9h70c62.5,0,115.9-45.2,126.1-106.9l32.9-198.3c3.8-22.9,23.6-39.8,46.9-39.8h40.3L2880.8,256.6L2880.8,256.6z"/>
+		<path class="st0" d="M380.1,423.5l-40.8,40.8c0.2,2.6,0.4,5.1,0.4,7.7c0,64.3-52.1,116.4-116.4,116.4S106.9,536.3,106.9,472
+			S159,355.7,223.3,355.7c37.7,0,71,18,92.3,45.7l76-76c-40.9-46.9-101.1-76.6-168.3-76.6C100,248.8,0,348.7,0,472.1
+			s100,223.3,223.3,223.3s223.3-100,223.3-223.3c0-16.7-1.8-32.9-5.3-48.5h-61.2V423.5z"/>
+	</g>
+	<g>
+		<path class="st0" d="M1297.8,3.5h54.1v57.1h49.4V3.5h54.1v161.7h-54.1v-58h-49.4v58h-54.1V3.5z"/>
+		<path class="st0" d="M1537.6,2.3h53.6l68.2,162.9h-58.7l-8.6-21.7h-56.6l-8.3,21.7h-57.8L1537.6,2.3z M1578.7,105.1l-14.8-39.3
+			l-14.8,39.3C1549.1,105.1,1578.7,105.1,1578.7,105.1z"/>
+		<path class="st0" d="M1673.4,3.5h79c28.6,0,46.9,7.2,58.2,18.5c9.7,9.7,14.8,21.7,14.8,38.3v0.5c0,23.6-12.2,40-31.9,49.4l37.7,55
+			h-61.7L1739,119h-0.5h-11.1v46.2h-54.1L1673.4,3.5L1673.4,3.5z M1750.8,80.4c12.9,0,20.8-5.8,20.8-15.7v-0.5
+			c0-10.4-8.1-15.5-20.6-15.5h-23.6v31.6L1750.8,80.4L1750.8,80.4z"/>
+		<path class="st0" d="M1887.3,49.2h-47.6V3.5H1989v45.7h-47.6v116h-54.1V49.2z"/>
+		<path class="st0" d="M2007.2,92.6V3.5h55V92c0,20.1,10.4,28.6,24.9,28.6s24.9-7.9,24.9-27.5V3.5h55v88c0,55.2-32.1,76.9-80.4,76.9
+			C2038.4,168.4,2007.2,146.2,2007.2,92.6z"/>
+		<path class="st0" d="M2191.5,3.5h50.6l57.5,71.4V3.5h53.6v161.7h-48.1L2245,90.6v74.6h-53.6V3.5H2191.5z"/>
+		<path class="st0" d="M2375.4,84.8v-0.5c0-48.3,38.1-84.3,89.2-84.3c27.7,0,50.1,9.2,67.7,24.5L2502,61
+			c-10.6-9-22.4-14.1-35.8-14.1c-21,0-36.3,16.2-36.3,38.1v0.5c0,22.9,15.9,38.6,38.6,38.6c9.2,0,14.3-1.4,18.5-3.7v-16.2h-27.7
+			V69.5h78.3v74.8c-17.6,14.3-42,24.3-71.4,24.3C2415.8,168.7,2375.4,134.9,2375.4,84.8z"/>
+	</g>
+</g>
+</svg>
diff --git a/themes/slate-es-de/gmaster/systeminfo.xml b/themes/slate-es-de/gmaster/systeminfo.xml
new file mode 100644
index 000000000..1c1f7e86b
--- /dev/null
+++ b/themes/slate-es-de/gmaster/systeminfo.xml
@@ -0,0 +1,22 @@
+<theme>
+    <view name="system">
+        <text name="info1">
+            <text>Manufacturer:  Hartung</text>
+        </text>
+        <text name="info2">
+            <text>Released:  1990</text>
+        </text>
+        <text name="info3">
+            <text>CPU:  NEC upd7810 @ 6 MHz</text>
+        </text>
+        <text name="info4">
+            <text>Resolution:  64×64 pixels, monochrome</text>
+        </text>
+        <text name="info5">
+            <text>Sound:  1-bit DAC</text>
+        </text>
+        <text name="info6">
+            <text>Media:  Cartridge</text>
+        </text>
+    </view>
+</theme>
\ No newline at end of file