diff --git a/CHANGES b/CHANGES
index 2aff452c5..430717069 100644
--- a/CHANGES
+++ b/CHANGES
@@ -84,6 +84,7 @@ Misc:
  - Qt: Add copy and QoL improvements to graphic views (closes mgba.io/i/1541)
  - Qt: Show list of all sprites in sprite view
  - Qt: Add option for disabling OSD messages
+ - Core: Add more memory search ops (closes mgba.io/i/1510)
 
 0.7.3: (2019-09-15)
 Emulation fixes:
diff --git a/include/mgba/core/mem-search.h b/include/mgba/core/mem-search.h
index c18c20922..d45601556 100644
--- a/include/mgba/core/mem-search.h
+++ b/include/mgba/core/mem-search.h
@@ -22,7 +22,11 @@ enum mCoreMemorySearchOp {
 	mCORE_MEMORY_SEARCH_EQUAL,
 	mCORE_MEMORY_SEARCH_GREATER,
 	mCORE_MEMORY_SEARCH_LESS,
+	mCORE_MEMORY_SEARCH_ANY,
 	mCORE_MEMORY_SEARCH_DELTA,
+	mCORE_MEMORY_SEARCH_DELTA_POSITIVE,
+	mCORE_MEMORY_SEARCH_DELTA_NEGATIVE,
+	mCORE_MEMORY_SEARCH_DELTA_ANY,
 };
 
 struct mCoreMemorySearchParams {
diff --git a/src/core/mem-search.c b/src/core/mem-search.c
index c6404638f..7f0c215a1 100644
--- a/src/core/mem-search.c
+++ b/src/core/mem-search.c
@@ -19,6 +19,14 @@ static bool _op(int32_t value, int32_t match, enum mCoreMemorySearchOp op) {
 	case mCORE_MEMORY_SEARCH_EQUAL:
 	case mCORE_MEMORY_SEARCH_DELTA:
 		return value == match;
+	case mCORE_MEMORY_SEARCH_DELTA_POSITIVE:
+		return value > 0;
+	case mCORE_MEMORY_SEARCH_DELTA_NEGATIVE:
+		return value < 0;
+	case mCORE_MEMORY_SEARCH_DELTA_ANY:
+		return value != 0;
+	case mCORE_MEMORY_SEARCH_ANY:
+		return true;
 	}
 	return false;
 }
@@ -244,20 +252,20 @@ bool _testGuess(struct mCore* core, struct mCoreMemorySearchResult* res, const s
 	int64_t value;
 	int32_t offset = 0;
 	char* end;
-	if (params->op == mCORE_MEMORY_SEARCH_DELTA) {
+	if (params->op >= mCORE_MEMORY_SEARCH_DELTA) {
 		offset = res->oldValue;
 	}
 
 	value = strtoll(params->valueStr, &end, 10);
 	if (end) {
 		res->oldValue += value;
-		if (_op(core->rawRead8(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (_op(core->rawRead8(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
-		if (!(res->address & 1) && (res->width >= 2 || res->width == -1) && _op(core->rawRead16(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (!(res->address & 1) && (res->width >= 2 || res->width == -1) && _op(core->rawRead16(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
-		if (!(res->address & 3) && (res->width >= 4 || res->width == -1) && _op(core->rawRead32(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (!(res->address & 3) && (res->width >= 4 || res->width == -1) && _op(core->rawRead32(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
 		res->oldValue -= value;
@@ -266,13 +274,13 @@ bool _testGuess(struct mCore* core, struct mCoreMemorySearchResult* res, const s
 	value = strtoll(params->valueStr, &end, 16);
 	if (end) {
 		res->oldValue += value;
-		if (_op(core->rawRead8(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (_op(core->rawRead8(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
-		if (!(res->address & 1) && (res->width >= 2 || res->width == -1) && _op(core->rawRead16(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (!(res->address & 1) && (res->width >= 2 || res->width == -1) && _op(core->rawRead16(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
-		if (!(res->address & 3) && (res->width >= 4 || res->width == -1) && _op(core->rawRead32(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier, value + offset, params->op)) {
+		if (!(res->address & 3) && (res->width >= 4 || res->width == -1) && _op(core->rawRead32(core, res->address, res->segment) * res->guessDivisor / res->guessMultiplier - offset, value, params->op)) {
 			return true;
 		}
 		res->oldValue -= value;
@@ -293,10 +301,7 @@ void mCoreMemorySearchRepeat(struct mCore* core, const struct mCoreMemorySearchP
 					--i;
 				}
 			} else if (params->type == mCORE_MEMORY_SEARCH_INT) {
-				int32_t oldValue = params->valueInt;
-				if (params->op == mCORE_MEMORY_SEARCH_DELTA) {
-					oldValue += res->oldValue;
-				}
+				int32_t match = params->valueInt;
 				int32_t value = 0;
 				switch (params->width) {
 				case 1:
@@ -311,7 +316,11 @@ void mCoreMemorySearchRepeat(struct mCore* core, const struct mCoreMemorySearchP
 				default:
 					break;
 				}
-				if (!_op(value, oldValue, params->op)) {
+				int32_t opValue = value;
+				if (params->op >= mCORE_MEMORY_SEARCH_DELTA) {
+					opValue -= res->oldValue;
+				}
+				if (!_op(opValue, match, params->op)) {
 					*res = *mCoreMemorySearchResultsGetPointer(inout, mCoreMemorySearchResultsSize(inout) - 1);
 					mCoreMemorySearchResultsResize(inout, -1);
 					--i;
@@ -322,7 +331,7 @@ void mCoreMemorySearchRepeat(struct mCore* core, const struct mCoreMemorySearchP
 			break;
 		case mCORE_MEMORY_SEARCH_STRING:
 		case mCORE_MEMORY_SEARCH_GUESS:
-			// TOOD
+			// TODO
 			break;
 		}
 	}
diff --git a/src/platform/qt/MemorySearch.cpp b/src/platform/qt/MemorySearch.cpp
index 4ff967da5..f3f82c9ed 100644
--- a/src/platform/qt/MemorySearch.cpp
+++ b/src/platform/qt/MemorySearch.cpp
@@ -35,19 +35,28 @@ MemorySearch::~MemorySearch() {
 }
 
 bool MemorySearch::createParams(mCoreMemorySearchParams* params) {
-	params->memoryFlags = mCORE_MEMORY_RW;
+	params->memoryFlags = mCORE_MEMORY_WRITE;
+	if (m_ui.searchROM->isChecked()) {
+		params->memoryFlags |= mCORE_MEMORY_READ;
+	}
 	mCore* core = m_controller->thread()->core;
 
 	QByteArray string;
 	bool ok = false;
 	if (m_ui.typeNum->isChecked()) {
 		params->type = mCORE_MEMORY_SEARCH_INT;
-		if (m_ui.opDelta->isChecked()) {
+		if (m_ui.opDelta->isChecked() || m_ui.opDelta0->isChecked()) {
 			params->op = mCORE_MEMORY_SEARCH_DELTA;
 		} else if (m_ui.opGreater->isChecked()) {
 			params->op = mCORE_MEMORY_SEARCH_GREATER;
 		} else if (m_ui.opLess->isChecked()) {
 			params->op = mCORE_MEMORY_SEARCH_LESS;
+		} else if (m_ui.opUnknown->isChecked()) {
+			params->op = mCORE_MEMORY_SEARCH_ANY;
+		} else if (m_ui.opDeltaPositive->isChecked()) {
+			params->op = mCORE_MEMORY_SEARCH_DELTA_POSITIVE;
+		} else if (m_ui.opDeltaNegative->isChecked()) {
+			params->op = mCORE_MEMORY_SEARCH_DELTA_NEGATIVE;
 		} else {
 			params->op = mCORE_MEMORY_SEARCH_EQUAL;
 		}
@@ -103,9 +112,15 @@ bool MemorySearch::createParams(mCoreMemorySearchParams* params) {
 		}
 		if (m_ui.numGuess->isChecked()) {
 			params->type = mCORE_MEMORY_SEARCH_GUESS;
-			m_string = m_ui.value->text().toLocal8Bit();
+			if (m_ui.opDelta0->isChecked()) {
+				m_string = QString("0").toLocal8Bit();
+			} else {
+				m_string = m_ui.value->text().toLocal8Bit();
+			}
 			params->valueStr = m_string.constData();
 			ok = true;
+		} else if (m_ui.opDelta0->isChecked()) {
+			params->valueInt = 0;
 		}
 	}
 	if (m_ui.typeStr->isChecked()) {
@@ -140,6 +155,9 @@ void MemorySearch::searchWithin() {
 	mCore* core = m_controller->thread()->core;
 
 	if (createParams(&params)) {
+		if (m_ui.opUnknown->isChecked()) {
+			params.op = mCORE_MEMORY_SEARCH_DELTA_ANY;
+		}
 		mCoreMemorySearchRepeat(core, &params, &m_results);
 	}
 
@@ -153,6 +171,9 @@ void MemorySearch::refresh() {
 	m_ui.results->clearContents();
 	m_ui.results->setRowCount(mCoreMemorySearchResultsSize(&m_results));
 	m_ui.opDelta->setEnabled(false);
+	m_ui.opDelta0->setEnabled(false);
+	m_ui.opDeltaPositive->setEnabled(false);
+	m_ui.opDeltaNegative->setEnabled(false);
 	for (size_t i = 0; i < mCoreMemorySearchResultsSize(&m_results); ++i) {
 		mCoreMemorySearchResult* result = mCoreMemorySearchResultsGetPointer(&m_results, i);
 		QTableWidgetItem* item = new QTableWidgetItem(QString("%1").arg(result->address, 8, 16, QChar('0')));
@@ -214,9 +235,18 @@ void MemorySearch::refresh() {
 		m_ui.results->setItem(i, 1, item);
 		m_ui.results->setItem(i, 2, type);
 		m_ui.opDelta->setEnabled(true);
+		m_ui.opDelta0->setEnabled(true);
+		m_ui.opDeltaPositive->setEnabled(true);
+		m_ui.opDeltaNegative->setEnabled(true);
 	}
 	if (m_ui.opDelta->isChecked() && !m_ui.opDelta->isEnabled()) {
 		m_ui.opEqual->setChecked(true);
+	} else if (m_ui.opDelta0->isChecked() && !m_ui.opDelta0->isEnabled()) {
+		m_ui.opEqual->setChecked(true);
+	} else if (m_ui.opDeltaPositive->isChecked() && !m_ui.opDeltaPositive->isEnabled()) {
+		m_ui.opEqual->setChecked(true);
+	} else if (m_ui.opDeltaNegative->isChecked() && !m_ui.opDeltaNegative->isEnabled()) {
+		m_ui.opEqual->setChecked(true);
 	}
 	m_ui.results->sortItems(0);
 }
diff --git a/src/platform/qt/MemorySearch.ui b/src/platform/qt/MemorySearch.ui
index 4e8649e42..7811c14a3 100644
--- a/src/platform/qt/MemorySearch.ui
+++ b/src/platform/qt/MemorySearch.ui
@@ -6,14 +6,20 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>540</width>
-    <height>491</height>
+    <width>725</width>
+    <height>813</height>
    </rect>
   </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
   <property name="minimumSize">
    <size>
     <width>540</width>
-    <height>241</height>
+    <height>400</height>
    </size>
   </property>
   <property name="windowTitle">
@@ -99,21 +105,21 @@
        </attribute>
       </widget>
      </item>
-     <item row="3" column="0" colspan="2">
+     <item row="4" column="0" colspan="2">
       <widget class="Line" name="line">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
       </widget>
      </item>
-     <item row="4" column="0">
+     <item row="5" column="0">
       <widget class="QLabel" name="label_3">
        <property name="text">
         <string>Width</string>
        </property>
       </widget>
      </item>
-     <item row="4" column="1">
+     <item row="5" column="1">
       <widget class="QRadioButton" name="bitsGuess">
        <property name="text">
         <string>Guess</string>
@@ -126,7 +132,7 @@
        </attribute>
       </widget>
      </item>
-     <item row="5" column="1">
+     <item row="6" column="1">
       <widget class="QRadioButton" name="bits8">
        <property name="text">
         <string>1 Byte (8-bit)</string>
@@ -136,7 +142,7 @@
        </attribute>
       </widget>
      </item>
-     <item row="6" column="1">
+     <item row="7" column="1">
       <widget class="QRadioButton" name="bits16">
        <property name="text">
         <string>2 Bytes (16-bit)</string>
@@ -146,7 +152,7 @@
        </attribute>
       </widget>
      </item>
-     <item row="7" column="1">
+     <item row="8" column="1">
       <widget class="QRadioButton" name="bits32">
        <property name="text">
         <string>4 Bytes (32-bit)</string>
@@ -159,21 +165,21 @@
        </attribute>
       </widget>
      </item>
-     <item row="8" column="0" colspan="2">
+     <item row="9" column="0" colspan="2">
       <widget class="Line" name="line_2">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
       </widget>
      </item>
-     <item row="9" column="0">
+     <item row="10" column="0">
       <widget class="QLabel" name="label_4">
        <property name="text">
         <string>Number type</string>
        </property>
       </widget>
      </item>
-     <item row="9" column="1">
+     <item row="10" column="1">
       <widget class="QRadioButton" name="numGuess">
        <property name="text">
         <string>Guess</string>
@@ -183,38 +189,38 @@
        </property>
       </widget>
      </item>
-     <item row="10" column="1">
+     <item row="11" column="1">
       <widget class="QRadioButton" name="numDec">
        <property name="text">
         <string>Decimal</string>
        </property>
       </widget>
      </item>
-     <item row="11" column="1">
+     <item row="12" column="1">
       <widget class="QRadioButton" name="numHex">
        <property name="text">
         <string>Hexadecimal</string>
        </property>
       </widget>
      </item>
-     <item row="12" column="0" colspan="2">
+     <item row="13" column="0" colspan="2">
       <widget class="Line" name="line_3">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
       </widget>
      </item>
-     <item row="13" column="0">
+     <item row="14" column="0">
       <widget class="QLabel" name="label_5">
        <property name="text">
-        <string>Compare</string>
+        <string>Search type</string>
        </property>
       </widget>
      </item>
-     <item row="13" column="1">
+     <item row="14" column="1">
       <widget class="QRadioButton" name="opEqual">
        <property name="text">
-        <string>Equal</string>
+        <string>Equal to value</string>
        </property>
        <property name="checked">
         <bool>true</bool>
@@ -224,20 +230,10 @@
        </attribute>
       </widget>
      </item>
-     <item row="14" column="1">
+     <item row="15" column="1">
       <widget class="QRadioButton" name="opGreater">
        <property name="text">
-        <string>Greater</string>
-       </property>
-       <attribute name="buttonGroup">
-        <string notr="true">op</string>
-       </attribute>
-      </widget>
-     </item>
-     <item row="15" column="1">
-      <widget class="QRadioButton" name="opLess">
-       <property name="text">
-        <string>Less</string>
+        <string>Greater than value</string>
        </property>
        <attribute name="buttonGroup">
         <string notr="true">op</string>
@@ -245,18 +241,84 @@
       </widget>
      </item>
      <item row="16" column="1">
+      <widget class="QRadioButton" name="opLess">
+       <property name="text">
+        <string>Less than value</string>
+       </property>
+       <attribute name="buttonGroup">
+        <string notr="true">op</string>
+       </attribute>
+      </widget>
+     </item>
+     <item row="17" column="1">
+      <widget class="QRadioButton" name="opUnknown">
+       <property name="text">
+        <string>Unknown/changed</string>
+       </property>
+       <attribute name="buttonGroup">
+        <string notr="true">op</string>
+       </attribute>
+      </widget>
+     </item>
+     <item row="18" column="1">
       <widget class="QRadioButton" name="opDelta">
        <property name="enabled">
         <bool>false</bool>
        </property>
        <property name="text">
-        <string>Delta</string>
+        <string>Changed by value</string>
        </property>
        <attribute name="buttonGroup">
         <string notr="true">op</string>
        </attribute>
       </widget>
      </item>
+     <item row="21" column="1">
+      <widget class="QRadioButton" name="opDelta0">
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+       <property name="text">
+        <string>Unchanged</string>
+       </property>
+       <attribute name="buttonGroup">
+        <string notr="true">op</string>
+       </attribute>
+      </widget>
+     </item>
+     <item row="19" column="1">
+      <widget class="QRadioButton" name="opDeltaPositive">
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+       <property name="text">
+        <string>Increased</string>
+       </property>
+       <attribute name="buttonGroup">
+        <string notr="true">op</string>
+       </attribute>
+      </widget>
+     </item>
+     <item row="20" column="1">
+      <widget class="QRadioButton" name="opDeltaNegative">
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+       <property name="text">
+        <string>Decreased</string>
+       </property>
+       <attribute name="buttonGroup">
+        <string notr="true">op</string>
+       </attribute>
+      </widget>
+     </item>
+     <item row="3" column="1">
+      <widget class="QCheckBox" name="searchROM">
+       <property name="text">
+        <string>Search ROM</string>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item row="2" column="0" colspan="2">
@@ -271,7 +333,7 @@
      <item>
       <widget class="QPushButton" name="search">
        <property name="text">
-        <string>Search</string>
+        <string>New Search</string>
        </property>
       </widget>
      </item>
@@ -318,10 +380,26 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>opDelta0</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>value</receiver>
+   <slot>setDisabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>231</x>
+     <y>768</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>272</x>
+     <y>26</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
  <buttongroups>
-  <buttongroup name="width"/>
   <buttongroup name="type"/>
   <buttongroup name="op"/>
+  <buttongroup name="width"/>
  </buttongroups>
 </ui>
diff --git a/src/platform/qt/SettingsView.ui b/src/platform/qt/SettingsView.ui
index 2dbb2fca7..0847639a7 100644
--- a/src/platform/qt/SettingsView.ui
+++ b/src/platform/qt/SettingsView.ui
@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>849</width>
+    <width>885</width>
     <height>797</height>
    </rect>
   </property>
@@ -2043,6 +2043,16 @@
    <signal>toggled(bool)</signal>
    <receiver>fastForwardHeldRatio</receiver>
    <slot>setDisabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+   </hints>
   </connection>
  </connections>
 </ui>