diff --git a/session_data.cpp b/session_data.cpp
index 8679f2a..48e5468 100644
--- a/session_data.cpp
+++ b/session_data.cpp
@@ -1,8 +1,76 @@
 #include "session_data.h"
+// #include "event_factory.h"
+#include "mapscanner.h"
+
 #include <algorithm>
 
 using std::vector;
 
+//---------------------------------------------------------
+//---------------- SurfaceData ----------------------------
+//---------------------------------------------------------
+
+bool SurfaceData::Init() {
+    // open map, read it
+    // asign map pointers
+    // init factories
+    str locationName = SessionData::gameData.locationID;
+    MapScanner scanner;
+    MapData data = scanner.getMap(locationName);
+    surfaceMatrix = data.surfaceMatrix;
+    mapHeight = data.mapHeight;
+    mapWidth = data.mapWidth;
+    SessionData::gameData.mapHeight = mapHeight;
+    SessionData::gameData.mapWidth = mapWidth;
+    return true;
+}
+
+int SurfaceData::getWidth() {
+    return mapWidth;
+}
+
+int SurfaceData::getHeight() {
+    return mapHeight;
+}
+
+short SurfaceData::getSurface(coord& point) {
+    if ((point.x <= 0 || point.x >= mapWidth) || (point.y <= 0 || point.y >= mapHeight))
+        return -1;
+    return surfaceMatrix[point.x][point.y];
+}
+
+bool SurfaceData::IsValidCoord(coord& point) {
+    if ((point.x < 0 || point.x > mapWidth) || (point.y < 0 || point.y > mapHeight))
+        return false;
+    return true;
+}
+
+bool SurfaceData::IsValidRadius(coord& point, short radius) {
+    if (
+        (point.x - radius <= 0) || 
+        (point.x + radius >= mapWidth) || 
+        (point.y + radius >= mapHeight) ||
+        (point.y - radius <= 0) ||
+        (!IsValidCoord(point))
+    ) return false;
+
+    bool flag = false;
+    coord temp;
+    for (int i = point.x - radius; i < point.x + radius; i++) {
+        for (int j = point.y - radius; j < point.y + radius; j++) {
+            temp.x = i; temp.y = j;
+            if (getSurface(temp)) flag = true;
+        }
+    }
+    
+    return flag;
+}
+
+bool SurfaceData::IsWalkable(coord& point) {
+    if (getSurface(point)) return true;
+    return false;
+}
+
 //---------------------------------------------------------
 //----------------- EventsData ----------------------------
 //---------------------------------------------------------
@@ -34,8 +102,8 @@ add event to map
     for (auto i : list) {
         Event event = i.second;
         
-        int width = GameData::mapWidth;
-        int height = GameData::mapHeight;
+        int width = SessionData::gameData.mapWidth;
+        int height = SessionData::gameData.mapHeight;
 
         coord eventCenter = event.GetCoord();
         if (eventCenter.x > width || eventCenter.y > height) throw "coordinates are out of range";
@@ -87,3 +155,12 @@ bool ArtifactsData::Init() {
 Artifact& ArtifactsData::getArtifact(const str key) {
     return currentArtifactsList.at(key);
 }
+
+//---------------------------------------------------------
+//--------------------- GameData --------------------------
+//---------------------------------------------------------
+
+bool GameData::Init() {
+    using namespace SessionData;
+    return eventsData.Init() && surfaceData.Init() && artifactsData.Init();
+}
\ No newline at end of file
diff --git a/session_data.h b/session_data.h
index 7290d13..ac7e951 100644
--- a/session_data.h
+++ b/session_data.h
@@ -9,10 +9,7 @@
 #include "event_factory.h"
 #include "artifact.h"
 // #include "artifact_factory.h"
-#include "mapdata.h"
-#include "mapscanner.h"
-#include "surface.h"
-
+#include "surface.h" //here is SurfaceData, temporary solution.
 
 class SystemData {
     // coming soon
@@ -21,14 +18,26 @@ class SystemData {
 class GameData {
 // stores finished events and other stuff
 public:
-//    bool Init();
-    static short getHeight();
-    static short getWidth();
-    static void setHeight(short);
-    static void setWidth(short);
+    bool Init(); 
+    int mapHeight;
+    int mapWidth;
+    str locationID; // ID of a map going to be loaded
+};
+
+class SurfaceData {
+public:
+    bool Init();
+    int getWidth();
+    int getHeight();
+    bool IsValidRadius(coord&, short);
+    bool IsValidCoord(coord&);
+    bool IsWalkable(coord&);
+    short getSurface(coord&);
+    Surface& getSurface(str);   
 private:
-    static short mapHeight;
-    static short mapWidth;    
+    int mapWidth, mapHeight;
+    short** surfaceMatrix;    // std::unordered_map<str, Surface> currentSurfaceList; // currently useless
+    // std::unordered_map<str, Surface> globalSurfaceList; //will be added in future
 };
 
 class EventsData {
@@ -36,6 +45,7 @@ class EventsData {
     bool Init();
     Event& getEvent(const str);
     Event& getEvent(coord);
+    void removeFrontEvent(coord); // no realization yet
     // more methods coming in future
 private:
     void SortEventVector(std::vector<Event>*);
@@ -53,8 +63,21 @@ class ArtifactsData {
     Artifact& getArtifact(const str);
 private:
     std::unordered_map<str, Artifact> currentArtifactsList;
-    std::unordered_map<str, Artifact> globalArtifactsList;
-
+    // std::unordered_map<str, Artifact> globalArtifactsList;
 };
 
+namespace SessionData {
+    SystemData systemData;
+    GameData gameData;
+    SurfaceData surfaceData;
+    EventsData eventsData;
+    ArtifactsData artifactsData;
+
+    // hero initialization
+    str name = "Hero";
+    str id = "super_hero";
+    coord start;
+    Hero hero(name, id, 1, 10, start, nullptr);
+}
+
 #endif //SESSION
\ No newline at end of file