diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8c9698b..15f832f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,7 @@ add_executable(PlatScifi
     src/worldobjects/player.h
     src/worldobjects/staticcollider.h
     src/worldobjects/staticdeadly.h
+    src/worldobjects/leveltp.h
     src/worldobjects/spike.h
 )
 target_link_libraries(PlatScifi PRIVATE sfml-graphics)
diff --git a/src/assets/level_0.csv b/src/assets/level_0.csv
index 0a64f07..057cd61 100644
--- a/src/assets/level_0.csv
+++ b/src/assets/level_0.csv
@@ -1,4 +1,5 @@
-// Example level (level_0.csv)
+// Example level (level_0)
+nextLevelName level_1
 // Bottom colliders
 StaticCollider, 3, 25, 6, 2
 StaticCollider, 9, 27, 10, 2
@@ -11,4 +12,6 @@ StaticCollider, 23, 29, 44, 19
 // Spike
 Spike, 28, 28
 // Static deadly section
-StaticDeadly, 33, 28, 5, 2
\ No newline at end of file
+StaticDeadly, 33, 28, 5, 2
+// Ending teleporter
+LevelTp, 55, 28
\ No newline at end of file
diff --git a/src/assets/level_1.csv b/src/assets/level_1.csv
new file mode 100644
index 0000000..aa9feb1
--- /dev/null
+++ b/src/assets/level_1.csv
@@ -0,0 +1,7 @@
+// Example level (level_1)
+// Cycle back to the start
+nextLevelName level_0
+// Bottom collider
+StaticCollider, 2, 30, 30, 2
+// Next level
+LevelTp, 50, 29
\ No newline at end of file
diff --git a/src/gamestate.cpp b/src/gamestate.cpp
index 5005a41..314b7e9 100644
--- a/src/gamestate.cpp
+++ b/src/gamestate.cpp
@@ -4,10 +4,28 @@ void GameState::spawnObject(WorldObject* object) {
     objects.push_back(object);
 }
 
-void GameState::update() {
+UpdateResult GameState::update() {
     for (WorldObject* object : objects) {
-        object->update(worldState, objects);
+        UpdateResult updateResult = object->update(worldState, objects);
+        if (updateResult == UpdateResult::NextLevel) {
+            // TODO: improve this
+            return UpdateResult::NextLevel;
+        }
     }
+    return UpdateResult::None;
+}
+
+std::string GameState::getLevelName() {
+    return levelName;
+}
+
+std::string GameState::getNextLevelName() {
+    return nextLevelName;
+}
+
+void GameState::updateLevelNames(std::string newLevelName, std::string newNextLevelName) {
+    levelName = newLevelName;
+    nextLevelName = newNextLevelName;
 }
 
 std::vector<WorldObject*>::iterator GameState::objectsBegin() {
@@ -19,10 +37,16 @@ std::vector<WorldObject*>::iterator GameState::objectsEnd() {
 }
 
 void GameState::clear() {
-    while (!objects.empty()) {
-        // TODO: good memory freeing?
-        delete objects.back();
-        objects.pop_back();
+    auto it = objects.begin();
+    while (it != objects.end()) {
+        if ((*it)->hasAttribute(ObjectAttribute::Persist)) {
+            // Do not delete
+            it++;
+        } else {
+            // TODO: good memory freeing?
+            delete *it;
+            it = objects.erase(it);
+        }
     }
 }
 
diff --git a/src/gamestate.h b/src/gamestate.h
index 618282f..822c4a8 100644
--- a/src/gamestate.h
+++ b/src/gamestate.h
@@ -8,17 +8,25 @@
 class GameState {
 private:
     WorldState worldState;
+    std::string levelName;
+    std::string nextLevelName;
     std::vector<WorldObject*> objects;
 
 public:
     // Spawn an object
     void spawnObject(WorldObject* object);
     // Update
-    void update();
+    UpdateResult update();
+    // Get the current level name
+    std::string getLevelName();
+    // Get the next level name
+    std::string getNextLevelName();
+    // Update the current level name
+    void updateLevelNames(std::string newLevelName, std::string newNextLevelName); 
     // Get all objects
     std::vector<WorldObject*>::iterator objectsBegin();
     std::vector<WorldObject*>::iterator objectsEnd();
-    // Clear all items
+    // Clear all objects from the world, aside from Persisting objects
     void clear();
     // Destructor to free memory
     ~GameState();
diff --git a/src/main.cpp b/src/main.cpp
index a88b0e0..264eac6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,7 +28,7 @@ int main() {
     gameState.spawnObject(player);
 
     // Debug: load a basic level from a txt file
-    worldSpawner.spawnWorld(gameState, "assets/level_0.csv");
+    worldSpawner.spawnWorld(gameState, "level_0");
     /*// Example level (level_0.csv)
     // Bottom colliders
     gameState.spawnObject(new StaticCollider(3, 25, 6, 2));
@@ -83,7 +83,12 @@ int main() {
         }
 
         // Update the game and world
-        gameState.update();
+        UpdateResult updateResult = gameState.update();
+        if (updateResult == UpdateResult::NextLevel) {
+            // Load the next level, if possible
+            // TODO: impl better
+            worldSpawner.spawnWorld(gameState, gameState.getNextLevelName());
+        }
 
         // Render the game and world
         window.clear(sf::Color(111, 201, 252));
diff --git a/src/worldobject.h b/src/worldobject.h
index 8da75d9..6d60783 100644
--- a/src/worldobject.h
+++ b/src/worldobject.h
@@ -8,13 +8,17 @@
 // The result of an update function
 enum class UpdateResult {
     None,
-    Destroy
+    Destroy,
+    NextLevel // TODO: better naming
 };
 
 // The attributes that an object can have
 enum class ObjectAttribute {
+    OverlapDetect,
     Collision,
-    Deadly
+    Deadly,
+    LevelTeleport,
+    Persist // Persist across levels
 };
 
 // Stores a world object
diff --git a/src/worldobjectincludes.h b/src/worldobjectincludes.h
index b71c2e1..3ffc0f1 100644
--- a/src/worldobjectincludes.h
+++ b/src/worldobjectincludes.h
@@ -7,3 +7,4 @@
 #include "worldobjects/staticcollider.h"
 #include "worldobjects/spike.h"
 #include "worldobjects/staticdeadly.h"
+#include "worldobjects/leveltp.h"
diff --git a/src/worldobjects/leveltp.h b/src/worldobjects/leveltp.h
new file mode 100644
index 0000000..46b0597
--- /dev/null
+++ b/src/worldobjects/leveltp.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "../worldobject.h"
+
+// An object that teleports the player to another level
+class LevelTp : public WorldObject {
+private:
+    long frameCount = 0;
+
+public:
+    // Constructor
+    LevelTp(double spawnx, double spawny) : WorldObject() {
+        locx = spawnx;
+        locy = spawny;
+        this->width = 1;
+        this->height = 1;
+        this->objectAttributes.insert(ObjectAttribute::OverlapDetect);
+	    this->objectAttributes.insert(ObjectAttribute::LevelTeleport);
+    }
+
+    // Override update: check with player
+    UpdateResult update(WorldState& worldState, std::vector<WorldObject*>& objects) {
+	// TODO: stuff
+        return UpdateResult::None;
+    }
+
+    // Override rendering
+    RenderData getRenderData() {
+        frameCount++;
+        // TODO: image?
+        return {
+            RenderType::Rectangle,
+            coordType,
+            locx + sin(frameCount / 20.0) * 0.3,
+            locy + cos(frameCount / 20.0) * 0.3,
+            width,
+            height,
+            { 66, 135, 245 },
+            ""
+        };
+    }
+};
diff --git a/src/worldobjects/player.h b/src/worldobjects/player.h
index 411fe08..eb5e3e5 100644
--- a/src/worldobjects/player.h
+++ b/src/worldobjects/player.h
@@ -14,6 +14,7 @@ class Player : public WorldObject {
     Player(double spawnx, double spawny) : WorldObject() {
         locx = spawnx;
         locy = spawny;
+        objectAttributes.insert(ObjectAttribute::Persist);
     }
 
     // Input: acceleration
@@ -58,6 +59,7 @@ class Player : public WorldObject {
         for (WorldObject* object : objects) {
             if (object == this) continue;
             bool collided = false;
+	        bool overlapped = false;
             if (object->hasAttribute(ObjectAttribute::Collision)) {
                 // X movement pushout
                 // todo: better way of doing the 0.1 thing
@@ -68,6 +70,7 @@ class Player : public WorldObject {
                         locx -= velx;
                         velx = 0;
                         collided = true;
+			            overlapped = true;
                     }
                 }
                 if (locx + width >= object->getLocx() && locx < object->getLocx() + object->getWidth()) {
@@ -77,17 +80,33 @@ class Player : public WorldObject {
                         locy -= vely;
                         vely = 0;
                         collided = true;
+			            overlapped = true;
                         // todo: should not be on ground on a bottom corner
                         onGround = true;
                     }
                 }
             }
+            if (object->hasAttribute(ObjectAttribute::OverlapDetect)) {
+                // Check overlap only
+                if (locy + height >= object->getLocy() && locy < object->getLocy() + object->getHeight()) {
+                    if (locx + width > object->getLocx() && locx < object->getLocx() + object->getWidth()) {
+                        // Hit
+                        overlapped = true;
+                    }
+                }
+            }
             // Collision stuff
             if (collided && object->hasAttribute(ObjectAttribute::Deadly)) {
                 // Die
                 // todo: impl
                 teleport(5, 10);
             }
+            if (overlapped && object->hasAttribute(ObjectAttribute::LevelTeleport)) {
+                // Teleport to the next level
+                // TODO: impl better
+                teleport(5, 10);
+                return UpdateResult::NextLevel;
+            }
         }
         return UpdateResult::None;
     }
diff --git a/src/worldobjects/spike.h b/src/worldobjects/spike.h
index cf8a9c1..e88acfe 100644
--- a/src/worldobjects/spike.h
+++ b/src/worldobjects/spike.h
@@ -31,9 +31,9 @@ class Spike : public WorldObject {
             RenderType::Image,
             coordType,
             locx,
-            locy - sin(frameCount / 400) * 0.3,
+            locy - sin(frameCount / 80.0) * 0.3,
             width,
-            height + sin(frameCount / 400) * 0.3,
+            height + sin(frameCount / 80.0) * 0.3,
             { 255, 0, 0 },
             "assets/spike.png"
         };
diff --git a/src/worldobjects/staticdeadly.h b/src/worldobjects/staticdeadly.h
index b0a4b06..6258048 100644
--- a/src/worldobjects/staticdeadly.h
+++ b/src/worldobjects/staticdeadly.h
@@ -16,7 +16,7 @@ class StaticDeadly : public WorldObject {
 	objectAttributes.insert(ObjectAttribute::Deadly);
     }
 
-    // Override update: gravity
+    // Override update
     UpdateResult update(WorldState& worldState, std::vector<WorldObject*>& objects) {
         return UpdateResult::None;
     }
diff --git a/src/worldspawner.cpp b/src/worldspawner.cpp
index e69de29..6f7f6fd 100644
--- a/src/worldspawner.cpp
+++ b/src/worldspawner.cpp
@@ -0,0 +1,51 @@
+#include "worldspawner.h"
+
+void WorldSpawner::spawnWorld(GameState& gameState, std::string levelName) {
+    // Load the file based on the level name
+    // todo: error handling
+    std::ifstream file("assets/" + levelName + ".csv");
+    std::string line;
+    std::string newNextLevelName = "level_0";
+    // Clear the world
+    gameState.clear();
+    // Update
+    while (std::getline(file, line)) {
+        // Parse line
+        std::vector<std::string> parsed;
+        std::string thisitem = "";
+        for (char c : line) {
+            if (c == ',') {
+                parsed.push_back(thisitem);
+                thisitem = "";
+            } else if (c != ' ' && c != '\n') {
+                thisitem += c;
+            }
+        }
+        if (thisitem != "") parsed.push_back(thisitem);
+        // Process arguments
+        // todo: error handling with try catch
+        if (parsed[0].rfind("//", 0) == 0) {
+            // Comment: skip
+        } else if (parsed[0] == "nextLevelName") {
+            newNextLevelName = parsed[1];
+        } else if (parsed[0] == "StaticCollider") {
+            gameState.spawnObject(new StaticCollider(
+                std::stoi(parsed[1]), std::stoi(parsed[2]), std::stoi(parsed[3]), std::stoi(parsed[4])
+            ));
+        } else if (parsed[0] == "Spike") {
+            gameState.spawnObject(new Spike(
+                std::stoi(parsed[1]), std::stoi(parsed[2])
+            ));
+        } else if (parsed[0] == "StaticDeadly") {
+            gameState.spawnObject(new StaticDeadly(
+                std::stoi(parsed[1]), std::stoi(parsed[2]), std::stoi(parsed[3]), std::stoi(parsed[4])
+            ));
+        } else if (parsed[0] == "LevelTp") {
+            gameState.spawnObject(new LevelTp(
+                std::stoi(parsed[1]), std::stoi(parsed[2])
+            ));
+        }
+    }
+    // Successful load: update the game state
+    gameState.updateLevelNames(levelName, newNextLevelName);
+}
diff --git a/src/worldspawner.h b/src/worldspawner.h
index b250df5..a7d3d34 100644
--- a/src/worldspawner.h
+++ b/src/worldspawner.h
@@ -16,41 +16,5 @@ class WorldSpawner {
         StaticCollider, 9, 27, 10, 2
         StaticCollider, 19, 25, 6, 2
     */
-    void spawnWorld(GameState& gameState, std::string worldfile) {
-        // Load the file
-        // todo: error handling
-        std::ifstream file(worldfile);
-        std::string line;
-        while (std::getline(file, line)) {
-            // Parse line
-            std::vector<std::string> parsed;
-            std::string thisitem = "";
-            for (char c : line) {
-                if (c == ',') {
-                    parsed.push_back(thisitem);
-                    thisitem = "";
-                } else if (c != ' ' && c != '\n') {
-                    thisitem += c;
-                }
-            }
-            if (thisitem != "") parsed.push_back(thisitem);
-            // Process arguments
-            // todo: error handling with try catch
-            if (parsed[0].rfind("//", 0) == 0) {
-                // Comment: skip
-            } else if (parsed[0] == "StaticCollider") {
-                gameState.spawnObject(new StaticCollider(
-                    std::stoi(parsed[1]), std::stoi(parsed[2]), std::stoi(parsed[3]), std::stoi(parsed[4])
-                ));
-            } else if (parsed[0] == "Spike") {
-                gameState.spawnObject(new Spike(
-                    std::stoi(parsed[1]), std::stoi(parsed[2])
-                ));
-            } else if (parsed[0] == "StaticDeadly") {
-		gameState.spawnObject(new StaticDeadly(
-                    std::stoi(parsed[1]), std::stoi(parsed[2]), std::stoi(parsed[3]), std::stoi(parsed[4])
-                ));
-	    }
-        }
-    }
+    void spawnWorld(GameState& gameState, std::string levelName); 
 };