diff --git a/game/game.cpp b/game/game.cpp
index 38fcc0c..a6b96d9 100644
--- a/game/game.cpp
+++ b/game/game.cpp
@@ -9,7 +9,7 @@
 Game::Game()
 {
     // advance simulation with 100 Hz
-    m_time_step = 1.0 / 100.0;
+    m_time_step          = 1.0 / 100.0;
     m_time_for_next_step = 0.0;
 
     m_state = new game::State();
@@ -33,13 +33,9 @@ bool Game::cycle(float dt)
 
         float a = 2.0 * M_PI * util::randf_0_1();
         float speed = 0.005;
-        m_state->players[0]->addCommand(new game::ShootCommand(a, speed));
-    }
 
-#if 1
-    if (dt >= 10.0) {
-        //std::cout<<"time to big: " << dt << std::endl;
-        dt = m_time_step;
+        m_state->players[0]->addCommand(new game::SetSpeedCommand(speed));
+        m_state->players[0]->addCommand(new game::ShootCommand(a));
     }
 
     //std::cout<<"adding dt: " << dt << std::endl;
@@ -57,11 +53,4 @@ bool Game::cycle(float dt)
     //std::cout << m_time_for_next_step << " s remaining time, " << steps << " steps taken." << std::endl;
 
     return true;
-#else
-    (void) dt;
-
-    m_state->advance(dt);
-
-    return true;
-#endif
 }
diff --git a/game/state/commands.cpp b/game/state/commands.cpp
index b84a214..2b82f27 100644
--- a/game/state/commands.cpp
+++ b/game/state/commands.cpp
@@ -10,23 +10,55 @@ namespace game {
         // TODO: idea
         // shoot multiple rockets at once or from different positions after
         // level up / upgrade ...
-        Missile *missile = new Missile(player, player->ship->position, m_angle, m_speed);
+        Missile *missile = new Missile(player, player->ship->position, m_angle, player->speed);
 
         Trace *trace = new Trace(missile);
         missile->trace = trace;
 
-        player->energy -= m_speed;
+        player->energy -= player->speed;
         player->missiles.push_back(missile);
 
         state->addTrace(trace);
     }
 
-    bool ShootCommand::allowed(const Player *player, const State *state) const
+    bool ShootCommand::ready(const Player *player, const State *state) const
     {
         (void) state;
 
         // TODO
-        return player->alive && player->energy >= m_speed;
+        return player->alive && player->energy >= player->speed;
         //return player->alive;
     }
+
+    void ChangeNameCommand::apply(Player *player, State *state) const
+    {
+        // discard if not unique
+        for (const Player *other : state->players) {
+            if (m_name == other->name) {
+                std::cout << "name '" << m_name << "' already given to player #" << other->id << std::endl;
+                return;
+            }
+        }
+
+        player->name = m_name;
+    }
+
+    void SetSpeedCommand::apply(Player *player, State *state) const
+    {
+        (void) state;
+        player->speed = m_speed;
+    }
+
+    void ClearTracesCommand::apply(Player *player, State *state) const
+    {
+        size_t i = 0;
+        while(i < state->traces.size()) {
+            Trace *trace = state->traces[i];
+            if (trace->missile == nullptr && trace->missile->player == player) {
+                state->deleteTrace(trace);
+            } else {
+                i++;
+            }
+        }
+    }
 }
diff --git a/game/state/commands.hpp b/game/state/commands.hpp
index 5c8ff97..4ed914f 100644
--- a/game/state/commands.hpp
+++ b/game/state/commands.hpp
@@ -9,6 +9,10 @@
 #include <iostream>
 
 namespace game {
+    /**
+     * Base class for commands.
+     * must derive from this.
+     */
     class Command {
     public:
         Command()
@@ -19,7 +23,11 @@ namespace game {
         {
         }
 
-        virtual bool allowed(const Player *player, const State *state) const
+        // check whether the command is ready to execute.
+        // if not, wait.
+        // note: stuff like for admin should be done in execute() to discard the
+        // command and not block the queue.
+        virtual bool ready(const Player *player, const State *state) const
         {
             (void) player;
             (void) state;
@@ -38,19 +46,74 @@ namespace game {
         virtual std::string name() const { return "<unnamed>"; }
     };
 
+    /**********************************************************************/
+    /* Implemented commands */
+    /**********************************************************************/
+
+    /*
+     * Shoot at angle and optional speed.
+     * TODO
+     */
     class ShootCommand : public Command {
     public:
-        ShootCommand(float angle, float speed) : m_angle(angle), m_speed(speed)
+        ShootCommand(float angle) : m_angle(angle)
         {
         }
 
         std::string name() const { return "<shoot>"; }
 
-        void apply(        Player *player,       State *state) const;
-        bool allowed(const Player *player, const State *state) const;
+        void apply(      Player *player,       State *state) const;
+        bool ready(const Player *player, const State *state) const;
 
     private:
         float m_angle;
+    };
+
+    /**
+     * Change the name of the player if it will be uniuqe.
+     */
+    class ChangeNameCommand : public Command {
+    public:
+        ChangeNameCommand(const std::string &name) : m_name(name)
+        {
+        }
+
+        std::string name() const { return "<change name>"; }
+
+        void apply(Player *player, State *state) const;
+
+    private:
+        std::string m_name;
+    };
+
+    /**
+     * clear all traces of this player that are done
+     */
+    class ClearTracesCommand : public Command {
+    public:
+        ClearTracesCommand()
+        {
+        }
+
+        std::string name() const { return "<clear traces>"; }
+
+        void apply(Player *player, State *state) const;
+    };
+
+    /**
+     * Set default speed of next shots for this player.
+     */
+    class SetSpeedCommand : public Command {
+    public:
+        SetSpeedCommand(float speed) : m_speed(speed)
+        {
+        }
+
+        std::string name() const { return "<set speed>"; }
+
+        void apply(Player *player, State *state) const;
+
+    private:
         float m_speed;
     };
 }
diff --git a/game/state/player.hpp b/game/state/player.hpp
index 199a411..3a6aeb4 100644
--- a/game/state/player.hpp
+++ b/game/state/player.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <string>
 #include <deque>
 #include <vector>
 
@@ -15,12 +16,14 @@ namespace game {
     public:
         int        id;
         bool       alive;
+        float      speed;
         float      energy;
         float      deadTimeCounter;
         Ship      *ship;
+        std::string name;
         std::vector<Missile*> missiles;
 
-        Player(int id) : id(id), alive(true), energy(0.0), ship(nullptr)
+        Player(int id) : id(id), alive(true), speed(0.01), energy(0.0), ship(nullptr), name("<unnamed>")
         {
         }
 
diff --git a/game/state/state.cpp b/game/state/state.cpp
index d84364d..71572e6 100644
--- a/game/state/state.cpp
+++ b/game/state/state.cpp
@@ -108,7 +108,7 @@ namespace game {
             // try to execute as much queued commands as possible.
             while (player->hasCommandInQueue()) {
                 Command *command = player->peekCommand();
-                if (!command->allowed(player, this)) {
+                if (!command->ready(player, this)) {
                     break;
                 }
 
@@ -290,6 +290,20 @@ namespace game {
         traces.push_back(trace);
     }
 
+    void State::deleteTrace(Trace *trace)
+    {
+        // TODO: if traces of running missile is deleted it is dangerous
+
+        size_t i = 0;
+        while(i < traces.size()) {
+            if (traces[i] == trace) {
+                delete(trace);
+                traces.erase(traces.begin()+i);
+                break;
+            }
+        }
+    }
+
     void State::addExplosionFromHit(const Missile::Event *evt)
     {
         if (evt->hit == Hit::Nothing || evt->hit == Hit::BorderOfUniverse) {
diff --git a/game/state/state.hpp b/game/state/state.hpp
index 3fa7781..42d0659 100644
--- a/game/state/state.hpp
+++ b/game/state/state.hpp
@@ -9,6 +9,18 @@
 
 #include "missile.hpp"
 
+// TODO:
+// give points for equipment / better weapons / more energy when:
+// - player discovers the universe
+//
+// - the shot which made a kill was much longer than the direkt line between
+//   player and his target
+//
+// - add wormholes
+// - add blackholes
+// - shoot through suns which add a fire mantle to the rocket to make it more
+//   thick and dangerous but it gets destroyed after some time.
+
 namespace game {
     // forward declarations
     class Command;
@@ -56,6 +68,7 @@ namespace game {
 
         // add a trace to the list of traces.
         void addTrace(Trace *trace);
+        void deleteTrace(Trace *trace);
 
         /*************************************************************************/
         /* Rendering */
diff --git a/game/state/trace.cpp b/game/state/trace.cpp
index 4d93d2c..392076e 100644
--- a/game/state/trace.cpp
+++ b/game/state/trace.cpp
@@ -24,4 +24,9 @@ namespace game {
             points.push_back(TracePoint(missile));
         }
     }
+
+    void Trace::finish()
+    {
+        missile = nullptr;
+    }
 }
diff --git a/game/state/trace.hpp b/game/state/trace.hpp
index ab33b2f..7af85dc 100644
--- a/game/state/trace.hpp
+++ b/game/state/trace.hpp
@@ -21,6 +21,10 @@ namespace game {
             // the missile) in case the fidelityCounter would skip the current position.
             void addPointFromMissile(bool forceAdd=false);
 
+            // call this to mark the trace as finish and disconnect it from the
+            // missile.
+            void finish();
+
             // TODO: add extendLastPointToPosition() method for saving points /
             // optimization later on