diff --git a/assets/stats.json b/assets/stats.json
new file mode 100644
index 0000000..59f8008
--- /dev/null
+++ b/assets/stats.json
@@ -0,0 +1,5 @@
+{
+	"Zombie" : {
+		
+	}
+}
\ No newline at end of file
diff --git a/include/td/Constants.h b/include/td/Constants.h
new file mode 100644
index 0000000..10e45e1
--- /dev/null
+++ b/include/td/Constants.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <cstdint>
+
+namespace td {
+
+constexpr int TPS = 20;
+constexpr float STEP_PERIOD = 1.0f / static_cast<float>(TPS);
+
+}  // namespace td
diff --git a/include/td/Types.h b/include/td/Types.h
index c293bf8..0bc9948 100644
--- a/include/td/Types.h
+++ b/include/td/Types.h
@@ -66,5 +66,6 @@ struct EntityCoords {
 };
 
 using PeerID = std::uint16_t;
+using StepsType = std::uint16_t;
 
 }  // namespace td
diff --git a/include/td/game/GameHistory.h b/include/td/game/GameHistory.h
index c5c4f61..2c951ed 100644
--- a/include/td/game/GameHistory.h
+++ b/include/td/game/GameHistory.h
@@ -9,12 +9,10 @@ namespace game {
 
 class GameHistory {
   private:
-	using HistorySizeType = std::uint16_t;
+	using HistorySizeType = StepsType;
 
 	std::vector<std::optional<protocol::LockStep>> m_History;
 	
-	HistorySizeType m_Cursor;
-
   public:
 	GameHistory();
 
@@ -24,10 +22,6 @@ class GameHistory {
 
 	bool HasLockStep(HistorySizeType a_Index) const;
 
-	const protocol::LockStep& GetNextStep();
-
-	bool HasNextStep() const;
-
 	void FromPacket(td::protocol::pdata::LockSteps&& a_Steps);
 
 	td::protocol::packets::LockSteps ToPacket(HistorySizeType a_StartIndex);
diff --git a/include/td/game/World.h b/include/td/game/World.h
new file mode 100644
index 0000000..41e6407
--- /dev/null
+++ b/include/td/game/World.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <td/game/GameHistory.h>
+#include <td/game/WorldState.h>
+#include <vector>
+
+namespace td {
+namespace game {
+
+class World {
+  private:
+	std::vector<WorldState> m_WorldStates;
+	GameHistory m_GameHistory;
+
+	float m_OffsetTime;
+
+  public:
+	World();
+
+	void Tick(float a_Delta);
+
+  private:
+	std::uint16_t GetCursorPos();
+};
+
+}  // namespace game
+}  // namespace td
diff --git a/include/td/game/WorldState.h b/include/td/game/WorldState.h
new file mode 100644
index 0000000..6db7a4a
--- /dev/null
+++ b/include/td/game/WorldState.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <td/protocol/command/Commands.h>
+
+namespace td {
+namespace game {
+
+class WorldState {
+  private:
+  	// list of players, mobs, towers, castles
+  public:
+	WorldState() {}
+
+	WorldState GetNextState(const protocol::LockStep& a_Step);
+
+  private:
+	void Tick(float a_Delta);
+};
+
+}  // namespace game
+}  // namespace td
diff --git a/include/td/network/EnetClient.h b/include/td/network/EnetClient.h
new file mode 100644
index 0000000..7b9637e
--- /dev/null
+++ b/include/td/network/EnetClient.h
@@ -0,0 +1 @@
+#pragma once
\ No newline at end of file
diff --git a/include/td/network/EnetConnection.h b/include/td/network/EnetConnection.h
new file mode 100644
index 0000000..7b9637e
--- /dev/null
+++ b/include/td/network/EnetConnection.h
@@ -0,0 +1 @@
+#pragma once
\ No newline at end of file
diff --git a/include/td/network/EnetServer.h b/include/td/network/EnetServer.h
new file mode 100644
index 0000000..7b9637e
--- /dev/null
+++ b/include/td/network/EnetServer.h
@@ -0,0 +1 @@
+#pragma once
\ No newline at end of file
diff --git a/src/td/game/GameHistory.cpp b/src/td/game/GameHistory.cpp
index 2ed127e..b3c30cf 100644
--- a/src/td/game/GameHistory.cpp
+++ b/src/td/game/GameHistory.cpp
@@ -3,7 +3,7 @@
 namespace td {
 namespace game {
 
-GameHistory::GameHistory() : m_History(std::numeric_limits<HistorySizeType>::max()), m_Cursor(0) {}
+GameHistory::GameHistory() : m_History(std::numeric_limits<HistorySizeType>::max()) {}
 
 void GameHistory::SetLockStep(HistorySizeType a_Index, protocol::LockStep&& a_LockStep) {
 	m_History[a_Index] = std::move(a_LockStep);
@@ -17,14 +17,6 @@ bool GameHistory::HasLockStep(HistorySizeType a_Index) const {
 	return m_History[a_Index].has_value();
 }
 
-const protocol::LockStep& GameHistory::GetNextStep() {
-	return GetLockStep(m_Cursor++);
-}
-
-bool GameHistory::HasNextStep() const {
-	return HasLockStep(m_Cursor);
-}
-
 void GameHistory::FromPacket(td::protocol::pdata::LockSteps&& a_Steps) {
 	for (int i = 0; i < LOCKSTEP_BUFFER_SIZE; i++) {
 		protocol::LockStep& step = a_Steps.m_LockSteps[i];
diff --git a/src/td/game/World.cpp b/src/td/game/World.cpp
new file mode 100644
index 0000000..19928b0
--- /dev/null
+++ b/src/td/game/World.cpp
@@ -0,0 +1,31 @@
+#include <td/game/World.h>
+
+#include <td/Constants.h>
+
+#include <limits>
+
+namespace td {
+namespace game {
+
+World::World() : m_WorldStates(std::numeric_limits<StepsType>::max()), m_OffsetTime(0) {}
+
+void World::Tick(float a_Delta) {
+	m_OffsetTime += a_Delta;
+
+	if (GetCursorPos() > m_WorldStates.size()) {
+		if (!m_GameHistory.HasLockStep(GetCursorPos())) {
+			// oupsi
+			return;
+		}
+		WorldState& lastState = m_WorldStates.back();
+		WorldState nextState = lastState.GetNextState(m_GameHistory.GetLockStep(GetCursorPos()));
+		m_WorldStates.push_back(std::move(nextState));
+	}
+}
+
+std::uint16_t World::GetCursorPos() {
+	return (std::uint16_t) m_OffsetTime * TPS;
+}
+
+}  // namespace game
+}  // namespace td
diff --git a/src/td/game/WorldState.cpp b/src/td/game/WorldState.cpp
new file mode 100644
index 0000000..c6a4905
--- /dev/null
+++ b/src/td/game/WorldState.cpp
@@ -0,0 +1,43 @@
+#include <td/game/WorldState.h>
+
+#include <td/Constants.h>
+
+#include <td/protocol/command/CommandVisitor.h>
+
+namespace td {
+namespace game {
+
+class CommandHandler : public protocol::CommandVisitor {
+  private:
+	WorldState& m_WorldState;
+
+  public:
+	CommandHandler(WorldState& a_WorldState) : m_WorldState(a_WorldState) {}
+
+	void Visit(const protocol::commands::End&) override {}
+	void Visit(const protocol::commands::PlaceTower&) override {}
+	void Visit(const protocol::commands::PlayerJoin&) override {}
+	void Visit(const protocol::commands::SpawnTroop&) override {}
+	void Visit(const protocol::commands::TeamChange&) override {}
+	void Visit(const protocol::commands::UpgradeTower&) override {}
+	void Visit(const protocol::commands::UseItem&) override {}
+};
+
+WorldState WorldState::GetNextState(const protocol::LockStep& a_Step) {
+	WorldState newState = *this;
+	CommandHandler handler(*this);
+	for (auto command : a_Step) {
+		handler.Check(*command);
+	}
+	newState.Tick(STEP_PERIOD);
+	return newState;
+}
+
+void WorldState::Tick(float a_Delta) {
+	// move mobs
+	// process towers
+	// process damages
+}
+
+}  // namespace game
+}  // namespace td