diff --git a/base_types.h b/base_types.h
index 934856e..9fffe77 100644
--- a/base_types.h
+++ b/base_types.h
@@ -5,11 +5,10 @@
 #include <QList>
 #include <QVector>
 
-struct Alien
+struct AlienType
 {
 	int Id; // uses for QHash
-	QString name;
-	int type;
+	int src;
 	QPointF pos;
 	float angle; // -180 .. 180
 	float speed;  // cells per tick (speed=1 is 60cells by 1 sec for 60fps e.g.)
@@ -17,24 +16,38 @@ struct Alien
 	QPoint finish;
 	QVector <QPointF> path;
 	int pathIndex;
+	int imgType;
+};
+
+
+struct srcAlienType
+{
+	QString name;
+	float speed;
+	float health;
+	float armor;
+	float regeneration;
+	bool isFlying;
+	unsigned int score;
+	int imgType;
 	unsigned int prise;
 };
 
 
-struct Tower
+struct TowerType
 {
-	QString name;
-	int type;
+	int src;
 	int AlienId; // aim alien
 	int PlayerId; // tower's owner
+	int imgType;
 	QPoint pos; // not QPointF because tower fixed on grid
 	float angle; // -180 .. 180
-	float range; // in cells
-	float reload; // time for reload in ticks
+	unsigned int reload; // time for reload in ticks
+	unsigned int build;
 };
 
 
-struct srcTrigger
+struct srcTriggerType
 {
 	enum triggerType
 	{
@@ -53,36 +66,44 @@ struct srcTrigger
 };
 
 
-struct srcSplash
+struct srcSplashType
 {
 	QString name;
 	int imgType;
 	float speed; // in cells
+	int lifetime;
 	bool autoControl;
 	QList <int> triggerIndexes;
 };
 
-struct srcTower
+
+struct srcTowerType
 {
 	QString name;
-	int type;
+	int imgType;
 	int PlayerId; // tower's owner
-	float range; // in cells
-	float reload; // time for reload in ticks
-	QList <srcTrigger> triggers;
-	QList <srcSplash> splashes;
+	unsigned int cost;
+	unsigned int reload;
+	unsigned int buildTime;
+	float radius; // in cells
+	float expByShot;
+	float expByKill;
+	float expByDamage;
+	QList <srcTriggerType> triggers;
+	QList <srcSplashType> splashes;
 };
 
 
-struct Splash
+struct SplashType
 {
 	int Id;
-	QString name;
-	int type;
+	int imgType;
+	int src;
 	QPoint TowerId; // parent tower (-1;-1) for null parent
+	int PlayerId;
 	int AlienId; // aim alien (different from tower.AlienId)
-	int lifetime; // in ticks
-	float radius; // in cells
+	QPointF destination;
+	int life; // in ticks
 	float angle; // -180 .. 180
 	QPointF pos;
 };
diff --git a/data.xml b/data.xml
index bc78134..3d203a0 100644
--- a/data.xml
+++ b/data.xml
@@ -34,6 +34,7 @@
 	</splashes>
 	<towers>
 		<tower id="1" imageType="1" name="rocket launcher" cost="30" buildTime="50" reload="20" splash="1" radius="3" expByDamage="0.04" expByKill="0.1" expByShot="0.15"/>
+		<tower id="3" imageType="1" name="rocket launcher 2" cost="30" buildTime="50" reload="20" splash="1" radius="3" expByDamage="0.04" expByKill="0.1" expByShot="0.15"/>
 		<tower id="2" imageType="2" name="gun" cost="10" buildTime="25" reload="5" splash="3" radius="1.5" expByDamage="0.1" expByShot="0.1" expByKill="0.2"/>
 	</towers>
 	<triggers>
@@ -41,4 +42,16 @@
 		<trigger id="3" name="explosion" type="onDestination" count="1" delParent="true" damage="5" radius="1.5"/>
 		<trigger id="4" name="smoke" type="onTimer" timer="2" count="1"/>
 	</triggers>
+	<chains>
+		<chain tower="1" parent="1" trigger="3" child="4"/>
+		<chain tower="1" parent="1" trigger="4" child="5"/>
+		<chain tower="3" parent="2" trigger="3" child="4"/>
+		<chain tower="3" parent="2" trigger="4" child="5"/>
+		<chain tower="2" parent="3" trigger="2"/>
+	</chains>
+	<towersOnLevels>
+		<towerOnLevel level="1" tower="1"/>
+		<towerOnLevel level="1" tower="2"/>
+		<towerOnLevel level="1" tower="3"/>
+	</towersOnLevels>
 </ADdata>
diff --git a/loader.cpp b/loader.cpp
index a262b11..ccb2735 100644
--- a/loader.cpp
+++ b/loader.cpp
@@ -27,8 +27,9 @@ void Loader::load()
 	readSplashes();
 	readTowers();
 	readTriggers();
-	//readChains();
-	//readLevTowers();
+	readChains();
+	//readUpgrades();
+	readLevTowers();
 	readWaves();
 	readWaveParts();
 	readLevWaves();
@@ -43,10 +44,6 @@ void Loader::create()
 	if (!cfile.open(QIODevice::WriteOnly))
 		return;
 	cfile.resize(0);
-	//	if (!doc.setContent(&file)) {
-	//		file.close();
-	//		return;
-	//	}
 	QDomElement elem;
 	QDomElement root = doc->createElement("ADdata");
 	doc->appendChild(root);
@@ -110,7 +107,6 @@ void Loader::create()
 	elem.setAttribute("autoControl","true");
 	elem.setAttribute("radius",1.2);
 	elem.setAttribute("id",0);
-
 	cfile.write(doc->toByteArray());
 	cfile.close();
 }
@@ -235,6 +231,53 @@ void Loader::readWaveParts()
 }
 
 
+void Loader::readChains()
+{
+	QDomNodeList celems = doc->elementsByTagName("chain");
+	for (int i=0; i<celems.size(); i++)
+	{
+		bool OK = true;
+		tbChain chain;
+		QDomNamedNodeMap nm = celems.at(i).attributes();
+		chain.towerId = nm.namedItem("tower").nodeValue().toInt();
+		if (!towers.contains(chain.towerId))
+		{
+			qCritical("invalid tower Id");
+			OK = false;
+		}
+		chain.childSplashId = nm.namedItem("child").nodeValue().toInt();
+		if (chain.childSplashId > 0)
+		{
+			if (!splashes.contains(chain.childSplashId))
+			{
+				qCritical("invalid child splash Id");
+				OK = false;
+			}
+		}
+		chain.parentSplashId = nm.namedItem("parent").nodeValue().toInt();
+		if (!splashes.contains(chain.parentSplashId))
+		{
+			qCritical("invalid parent splash Id");
+			OK = false;
+		}
+		chain.triggerId = nm.namedItem("trigger").nodeValue().toInt();
+		if (!triggers.contains(chain.triggerId))
+		{
+			qCritical("invalid parent splash Id");
+			OK = false;
+		}
+		if (OK)
+		{
+			chains.insert(chain.towerId,chain);
+			qDebug() << tr("Tower=%1 parent=%2 child=%3 trigger=%4").arg(chain.towerId).arg(chain.parentSplashId).arg(chain.childSplashId).arg(chain.triggerId);
+		}
+	}
+	qDebug("================");
+	qDebug() << tr("Found %1 chains").arg(chains.size());
+	qDebug("================");
+}
+
+
 void Loader::readLevWaves()
 {
 	QDomNodeList lwelems = doc->elementsByTagName("waveOnLevel");
@@ -267,6 +310,38 @@ void Loader::readLevWaves()
 }
 
 
+void Loader::readLevTowers()
+{
+	QDomNodeList ltelems = doc->elementsByTagName("towerOnLevel");
+	for (int i=0; i<ltelems.size(); i++)
+	{
+		bool OK = true;
+		tbTowerOnLevel lt;
+		QDomNamedNodeMap nm = ltelems.at(i).attributes();
+		lt.levelId= nm.namedItem("level").nodeValue().toInt();
+		if (!levels.contains(lt.levelId))
+		{
+			qCritical("invalid level Id");
+			OK = false;
+		}
+		lt.towerId = nm.namedItem("tower").nodeValue().toInt();
+		if (!towers.contains(lt.towerId))
+		{
+			qCritical("invalid tower Id");
+			OK = false;
+		}
+		if (OK)
+		{
+			levTowers.insert(lt.levelId,lt);
+			qDebug() << tr("level=%1 tower=%2").arg(lt.levelId).arg(lt.towerId);
+		}
+	}
+	qDebug("================");
+	qDebug() << tr("Found %1 Towers On Level").arg(levTowers.size());
+	qDebug("================");
+}
+
+
 void Loader::readLevels()
 {
 	QDomNodeList lelems = doc->elementsByTagName("level");
diff --git a/loader.h b/loader.h
index 29344e6..95fbfe7 100644
--- a/loader.h
+++ b/loader.h
@@ -179,6 +179,7 @@ private:
 	QMultiHash <int,tbChain> chains;
 	QMultiHash <int,tbMorph> morphs;
 	QMultiHash <int,tbTowerOnLevel> levTowers;
+	QMultiHash <int,tbUpgrade> upgrades;
 
 	void readAliens();
 	void readMaps();
@@ -192,6 +193,7 @@ private:
 	void readWaves();
 	void readLevWaves();
 	void readWaveParts();
+	void readUpgrades();
 
 	void validate();
 	void load();
diff --git a/schema.xml b/schema.xml
index bc491c2..2278e89 100644
--- a/schema.xml
+++ b/schema.xml
@@ -67,6 +67,20 @@
 						</xsd:sequence>
 					</xsd:complexType>
 				</xsd:element>
+				<xsd:element name="chains">
+					<xsd:complexType>
+						<xsd:sequence>
+							<xsd:element name="chain" type="chainType" maxOccurs="unbounded"/>
+						</xsd:sequence>
+					</xsd:complexType>
+				</xsd:element>
+				<xsd:element name="towersOnLevels">
+					<xsd:complexType>
+						<xsd:sequence>
+							<xsd:element name="towerOnLevel" type="towerOnLevelType" maxOccurs="unbounded"/>
+						</xsd:sequence>
+					</xsd:complexType>
+				</xsd:element>
 			</xsd:sequence>
 		</xsd:complexType>
     </xsd:element>
@@ -146,18 +160,25 @@
 	</xsd:complexType>
 
     <xsd:complexType name="morphType">
-		<xsd:attribute name="from" type="xsd:nonNegativeInteger" use="required"/>
-		<xsd:attribute name="to" type="xsd:nonNegativeInteger" use="required"/>
+		<xsd:attribute name="from" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="to" type="xsd:positiveInteger" use="required"/>
 		<xsd:attribute name="cost" type="xsd:positiveInteger" use="required"/>
 		<xsd:attribute name="expRequired" type="xsd:float" use="required"/>
 	</xsd:complexType>
 
     <xsd:complexType name="wavePartType">
-		<xsd:attribute name="alien" type="xsd:nonNegativeInteger" use="required"/>
-		<xsd:attribute name="wave" type="xsd:nonNegativeInteger" use="required"/>
+		<xsd:attribute name="alien" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="wave" type="xsd:positiveInteger" use="required"/>
 		<xsd:attribute name="count" type="xsd:positiveInteger" use="required"/>
 	</xsd:complexType>
 
+    <xsd:complexType name="chainType">
+		<xsd:attribute name="tower" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="parent" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="trigger" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="child" type="xsd:positiveInteger" use="optional"/>
+	</xsd:complexType>
+
     <xsd:complexType name="waveType">
 		<xsd:attribute name="id" type="xsd:positiveInteger" use="required"/>
 		<xsd:attribute name="timeout" type="xsd:nonNegativeInteger" use="required"/>
@@ -166,13 +187,13 @@
 	</xsd:complexType>
 
     <xsd:complexType name="waveOnLevelType">
-		<xsd:attribute name="level" type="xsd:nonNegativeInteger" use="required"/>
-		<xsd:attribute name="wave" type="xsd:nonNegativeInteger" use="required"/>
+		<xsd:attribute name="level" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="wave" type="xsd:positiveInteger" use="required"/>
 	</xsd:complexType>
 
     <xsd:complexType name="towerOnLevelType">
-		<xsd:attribute name="level" type="xsd:nonNegativeInteger" use="required"/>
-		<xsd:attribute name="tower" type="xsd:nonNegativeInteger" use="required"/>
+		<xsd:attribute name="level" type="xsd:positiveInteger" use="required"/>
+		<xsd:attribute name="tower" type="xsd:positiveInteger" use="required"/>
 		<!--xsd:attribute name="enableWave" type="xsd:nonNegativeInteger" use="optional"-->
 	</xsd:complexType>