diff --git a/Levels/LEVEL1.PLT b/Levels/LEVEL1.PLT
index ef29b6e..51f4ca5 100644
--- a/Levels/LEVEL1.PLT
+++ b/Levels/LEVEL1.PLT
@@ -11,9 +11,19 @@ ARRIVAL;PHX2015;100;00:10;0;360
 ARRIVAL;PHX2016;100;00:40;0;360
 ARRIVAL;PHX2017;100;00:50;0;360
 ARRIVAL;PHX2018;100;01:40;0;360
-ARRIVAL;PHX2018;100;01:20;0;360
-ARRIVAL;PHX2018;100;02:00;0;360
+ARRIVAL;PHX2019;100;01:20;0;360
+ARRIVAL;PHX2020;100;02:00;0;360
+ARRIVAL;PHX2021;100;00:05;0;360
+ARRIVAL;PHX2022;100;00:15;0;360
+ARRIVAL;PHX2023;100;00:45;0;360
+ARRIVAL;PHX2024;100;01:45;0;360
+ARRIVAL;PHX2025;100;01:20;0;360
+ARRIVAL;PHX2026;100;01:10;0;360
 DEPARTURE;PHX1000;100;00:05;19;180
+DEPARTURE;PHX1001;100;00:15;19;180
+DEPARTURE;PHX1002;100;00:30;19;180
+DEPARTURE;PHX1003;100;00:45;19;180
+DEPARTURE;PHX1004;100;01:10;19;180
 DEPARTURE;PHX1280;100;01:30;19;180
 DEPARTURE;PHX1332;100;00:50;21;180
 DEPARTURE;PHX1333;100;01:00;19;180
diff --git a/Source/Game.c b/Source/Game.c
index 7626598..fdf9f8a 100644
--- a/Source/Game.c
+++ b/Source/Game.c
@@ -1077,6 +1077,26 @@ char* GetGameLevelTitle(void)
 	return GameLevelTitle;
 }
 
+/* ******************************************************************************************
+ * 
+ * @name: void GameAircraftState(uint8_t i)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  TYPE_PLAYER* ptrPlayer:
+ *      Pointer to a player structure
+ *
+ * 
+ * @brief:
+ * 	Draws all tiles depending on GameLevelBuffer configuration.
+ *  
+ * @remarks:
+ * 	Tiles are usually rendered with normal RGB values unless parking/runway is busy
+ *  or ptrPlayer->InvalidPath == true.
+ * 
+ * ******************************************************************************************/
+ 
 void GameAircraftState(uint8_t i)
 {
 	uint16_t target[2] = {0};
@@ -1166,6 +1186,26 @@ void GameAircraftState(uint8_t i)
     }
 }
 
+/* ******************************************************************************************
+ * 
+ * @name: void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  TYPE_PLAYER* ptrPlayer:
+ *      Pointer to a player structure
+ *
+ * 
+ * @brief:
+ * 	Draws all tiles depending on GameLevelBuffer configuration.
+ *  
+ * @remarks:
+ * 	Tiles are usually rendered with normal RGB values unless parking/runway is busy
+ *  or ptrPlayer->InvalidPath == true.
+ * 
+ * ******************************************************************************************/
+
 void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 {
 	uint16_t i;
@@ -1173,7 +1213,7 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 	uint8_t columns = 0;
 	uint8_t rows = 0;
 	bool flip_id;
-	bool used_rwy;
+	bool used_rwy = SystemContains_u16(ptrPlayer->RwyArray[0], GameUsedRwy, GAME_MAX_RUNWAYS);
 	uint8_t aux_id;
 	GsSprite * ptrTileset;
 	const uint8_t rwy_sine_step = 24;
@@ -1181,11 +1221,14 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 	static bool rwy_sine_decrease = false;
 	TYPE_ISOMETRIC_POS tileIsoPos;
 	TYPE_CARTESIAN_POS tileCartPos;
+
+    uint16_t init_timer_value = 0;
+    uint16_t end_timer_value = 0;
 	
 	// Prepare runway to be painted in blue if player is on runway selection mode
 	if(ptrPlayer->SelectRunway == true)
 	{
-		GameGetSelectedRunwayArray(GameRwy[ptrPlayer->SelectedRunway], ptrPlayer->RwyArray, sizeof(ptrPlayer->RwyArray));
+		
 		/*Serial_printf("Runway array:\n");
 		
 		for(j = 0; j < GAME_MAX_RWY_LENGTH; j++)
@@ -1312,8 +1355,6 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
         {
             continue;
         }
-		
-		used_rwy = false;
 
 		ptrTileset->r = NORMAL_LUMINANCE;
 		ptrTileset->g = NORMAL_LUMINANCE;
@@ -1325,17 +1366,6 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 						&&
 			(SystemContains_u16(i, ptrPlayer->RwyArray, GAME_MAX_RWY_LENGTH) == true)	)
 		{
-			for(j = 0; j < GAME_MAX_RUNWAYS; j++)
-			{
-				if(GameUsedRwy[j] != 0)
-				{
-					if(SystemContains_u16(GameUsedRwy[j], ptrPlayer->RwyArray, GAME_MAX_RWY_LENGTH) == true)
-					{
-						used_rwy = true;
-						break;
-					}
-				}
-			}
 			
 			if(used_rwy == true)
 			{
@@ -1382,32 +1412,11 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 							(CurrentTile == TILE_RWY_HOLDING_POINT_2)	)	)
 			{
 				bool bHoldingRwyBusy = false;
-				
-				for(j = 0; j < FlightData.nAircraft; j++)
-				{
-					uint16_t* targets = AircraftGetTargets(j);
-					uint16_t aircraftTile = AircraftGetTileFromFlightDataIndex(j);
-					uint16_t lastTarget = 0;
-					uint8_t k;
 
-					for(k = 0; k < AIRCRAFT_MAX_TARGETS; k++)
-					{
-						if(targets[k] == 0)
-						{
-							break;
-						}
+                init_timer_value = GetRCnt(2);
 
-						lastTarget = targets[k];
-					}
 
-					if( (i == aircraftTile)
-								||
-						(i == lastTarget)	)
-					{
-						bHoldingRwyBusy = true;
-						break;
-					}
-				}
+                end_timer_value = GetRCnt(2);
 				
 				if(bHoldingRwyBusy == true)
 				{
@@ -1484,14 +1493,55 @@ void GameRenderLevel(TYPE_PLAYER* ptrPlayer)
 			ptrTileset->attribute &= ~(H_FLIP);
 		}
 	}
+
+    dprintf("GameRenderLevel execution time = %d\t"
+            "end_timer_value = 0x%04X\tinit_timer_value = 0x%04X\n",
+            end_timer_value - init_timer_value,
+            end_timer_value,
+            init_timer_value                                );
 }
 
+/* *******************************************************************
+ * 
+ * @name: void GameSetTime(uint8_t hour, uint8_t minutes)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 	Reportedly, it sets game time to specified hour and minutes.
+ *	
+ * 
+ * @remarks:
+ * 	To be used on GameInit() after PLT file parsing.
+ * 
+ * *******************************************************************/
+
 void GameSetTime(uint8_t hour, uint8_t minutes)
 {
 	GameHour = hour;
 	GameMinutes = minutes;
 }
 
+/* *******************************************************************
+ * 
+ * @name: void GameActiveAircraft(uint8_t i)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  uint8_t i:
+ *      Index from FlightData array.
+ * 
+ * @brief:
+ * 	On each game cycle, FlightData.ActiveAircraft is set to 0 and
+ *  number of active aircraft is recalculated.
+ * 
+ * @remarks:
+ * 	Called ciclically from GameCalculations(). This function is
+ *  executed GAME_MAX_AIRCRAFT times on each cycle.
+ * 
+ * *******************************************************************/
+
 void GameActiveAircraft(uint8_t i)
 {
     // Reset iterator when i == 0.
@@ -1507,6 +1557,29 @@ void GameActiveAircraft(uint8_t i)
     }
 }
 
+/* ******************************************************************************************
+ * 
+ * @name: void GameStateShowAircraft(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  TYPE_PLAYER* ptrPlayer:
+ *      Pointer to a player structure
+ *
+ *  TYPE_FLIGH_DATA* ptrFlightData:
+ *      In the end, pointer to FlightData data table, which contains
+ *      information about all available flights.
+ * 
+ * @brief:
+ * 	Handles ptrPlayer->ShowAircraftData state.
+ *  
+ * 
+ * @remarks:
+ * 	Called ciclically from GamePlayerHandler().
+ * 
+ * ******************************************************************************************/
+
 void GameStateShowAircraft(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
 {
 	if(ptrPlayer->ShowAircraftData == true)
@@ -1527,6 +1600,29 @@ void GameStateShowAircraft(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightDa
 	}
 }
 
+/* ******************************************************************************************
+ * 
+ * @name: void GameStateLockTarget(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  TYPE_PLAYER* ptrPlayer:
+ *      Pointer to a player structure
+ *
+ *  TYPE_FLIGH_DATA* ptrFlightData:
+ *      In the end, pointer to FlightData data table, which contains
+ *      information about all available flights.
+ * 
+ * @brief:
+ * 	Handles ptrPlayer->LockTarget state.
+ *  
+ * 
+ * @remarks:
+ * 	Called ciclically from GamePlayerHandler().
+ * 
+ ******************************************************************************************/
+
 void GameStateLockTarget(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
 {
 	uint8_t AircraftIdx = ptrPlayer->FlightDataSelectedAircraft;
@@ -1572,6 +1668,29 @@ void GameStateLockTarget(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData
 	}
 }
 
+/* ******************************************************************************************
+ * 
+ * @name: void GameStateSelectTaxiwayRunway(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @param:
+ *  TYPE_PLAYER* ptrPlayer:
+ *      Pointer to a player structure
+ *
+ *  TYPE_FLIGH_DATA* ptrFlightData:
+ *      In the end, pointer to FlightData data table, which contains
+ *      information about all available flights.
+ * 
+ * @brief:
+ * 	Handler for ptrPlayer->SelectTaxiwayRunway.
+ *  
+ * 
+ * @remarks:
+ * 	Called ciclically from GamePlayerHandler().
+ * 
+ * ******************************************************************************************/
+
 void GameStateSelectTaxiwayRunway(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightData)
 {
 	TYPE_ISOMETRIC_POS IsoPos = CameraGetIsoPos(ptrPlayer);
@@ -1757,6 +1876,8 @@ void GameStateSelectRunway(TYPE_PLAYER* ptrPlayer, TYPE_FLIGHT_DATA* ptrFlightDa
 		// Under this mode, always reset locking target.
 		ptrPlayer->LockTarget = false;
 		ptrPlayer->LockedAircraft = FLIGHT_DATA_INVALID_IDX;
+
+        GameGetSelectedRunwayArray(GameRwy[ptrPlayer->SelectedRunway], ptrPlayer->RwyArray, sizeof(ptrPlayer->RwyArray));
 		
 		CameraMoveToIsoPos(ptrPlayer, IsoPos);
 		
diff --git a/Source/Makefile b/Source/Makefile
index 1567492..dfe4290 100644
--- a/Source/Makefile
+++ b/Source/Makefile
@@ -39,13 +39,9 @@ OBJECTS = $(addprefix $(OBJ_DIR)/,main.o System.o Menu.o Gfx.o Pad.o MainMenuBtn
 
 DEPS = $(OBJECTS:.o=.d)
 
-all: levels image
+build: levels $(PROJECT).bin
 
-rebuild: clean all
-
-build: $(PROJECT).exe
-
-objects: $(OBJECTS)
+rebuild: clean build
 
 -include $(DEPS)
 			
@@ -57,24 +53,27 @@ clean:
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.c $(OBJ_DIR)/%.d
 	$(CC) $< -o $@ $(DEFINE) $(CC_FLAGS) -MMD
 	
-$(PROJECT).elf: objects
+$(PROJECT).elf: $(OBJECTS)
 	$(LINKER) Obj/*.o -o Exe/$(PROJECT).elf $(LIBS) -Wl,--gc-sections
+
+$(PROJECT).iso: $(PROJECT).exe
+#	rm -f $@
+	mkisofs -o $(PROJECT).iso -V $(PROJECT) -sysid PLAYSTATION ../cdimg
+
+$(PROJECT).bin: $(PROJECT).iso
+	rm -f $@
+	rm -f $(PROJECT).cue
+	mkpsxiso $(PROJECT).iso $(PROJECT).bin $(LICENSE_FILE) $(MUSIC_TRACKS)
+# $(PROJECT).cue is automatically generated by mkpsxiso
+	rm -f $^
+	mv $@ ../Bin
+	mv $(PROJECT).cue ../Bin
+	$(GNU_SIZE) Exe/$(PROJECT).elf
 	
 $(PROJECT).exe: $(PROJECT).elf
 	$(ELF2EXE) Exe/$(PROJECT).elf Exe/$(PROJECT).exe $(ELF2EXE_FLAGS)
 	cp Exe/$(PROJECT).exe ../cdimg
 	
-image: build
-	rm -f $(PROJECT).iso $(PROJECT).bin
-	rm -f $(PROJECT).cue
-	mkisofs -o $(PROJECT).iso -V $(PROJECT) -sysid PLAYSTATION ../cdimg
-	mkpsxiso $(PROJECT).iso $(PROJECT).bin $(LICENSE_FILE) $(MUSIC_TRACKS)
-	mv $(PROJECT).bin ../Bin
-	mv $(PROJECT).cue ../Bin
-	rm -f $(PROJECT).cue
-	rm -f $(PROJECT).iso
-	$(GNU_SIZE) Exe/$(PROJECT).elf
-	
 emulator:
 	export PATH=$$PATH:$(EMULATOR_DIR)
 	$(EMULATOR) -cdfile $(PROJECT_DIR)/Bin/$(PROJECT).bin $(EMULATOR_FLAGS)
diff --git a/Source/System.c b/Source/System.c
index 2a527ae..6444b37 100644
--- a/Source/System.c
+++ b/Source/System.c
@@ -27,6 +27,7 @@
  
 static void SystemCheckTimer(bool* timer, uint64_t* last_timer, uint8_t step);
 static void SystemSetStackPattern(void);
+static void ISR_RootCounter2(void);
 
 /* *************************************
  * 	Local Variables
@@ -117,13 +118,26 @@ void SystemInit(void)
 	
 	SystemSetStackPattern();
 	
-	SetRCnt(RCntCNT2,0xFFFF,RCntSC);
-	StartRCnt(RCntCNT2);
+	//SetRCntHandler(&ISR_RootCounter2, 2, 0xA560);
+
+    Serial_printf("Begin SetRCntHandler\n");
+	SetRCntHandler(&ISR_RootCounter2, 2, 0xFFFF);
+    Serial_printf("End SetRCntHandler\n");
+
+    SystemEnableRCnt2Interrupt();
+}
+
+static volatile uint16_t u16_0_01seconds_cnt;
+
+void ISR_RootCounter2(void)
+{
+    Serial_printf("YO\n");
+    u16_0_01seconds_cnt++;
 }
 
 /* *******************************************************************
  * 
- * @name: void SystemInit(void)
+ * @name: void SystemSetRandSeed(void)
  * 
  * @author: Xavier Del Campo
  * 
@@ -1178,8 +1192,8 @@ void SystemDevMenu(void)
         DEVMENU_PAD2_RAW_DATA_TEXT_X = DEVMENU_PAD2_ID_TEXT_X,
         DEVMENU_PAD2_RAW_DATA_TEXT_Y = DEVMENU_PAD2_ID_TEXT_Y + DEVMENU_TEXT_GAP,
 
-        DEVMENU_ROOTCNT0_TEXT_X = DEVMENU_PAD2_RAW_DATA_TEXT_X,
-        DEVMENU_ROOTCNT0_TEXT_Y = DEVMENU_PAD2_RAW_DATA_TEXT_Y + DEVMENU_TEXT_GAP,
+        DEVMENU_ROOTCNT2_TEXT_X = DEVMENU_PAD2_RAW_DATA_TEXT_X,
+        DEVMENU_ROOTCNT2_TEXT_Y = DEVMENU_PAD2_RAW_DATA_TEXT_Y + DEVMENU_TEXT_GAP,
     };
 
     if(devmenu_flag == true)
@@ -1243,10 +1257,16 @@ void SystemDevMenu(void)
                         "Pad2 raw data = 0x%04X",
                         PadTwoGetRawData()   );
 
+        /*FontPrintText(  &SmallFont,
+                        DEVMENU_ROOTCNT2_TEXT_X,
+                        DEVMENU_ROOTCNT2_TEXT_Y,
+                        "Timer2 = 0x%04X",
+                        GetRCnt(2) );*/
+
         FontPrintText(  &SmallFont,
-                        DEVMENU_ROOTCNT0_TEXT_X,
-                        DEVMENU_ROOTCNT0_TEXT_Y,
-                        "Timer0 = 0x%04X",
-                        (uint16_t)((*(uint32_t*)0x1F801100) & 0x00FF) );
+                        DEVMENU_ROOTCNT2_TEXT_X,
+                        DEVMENU_ROOTCNT2_TEXT_Y,
+                        "Timer2 = 0x%04X, timer2 = 0x%04X",
+                        u16_0_01seconds_cnt, GetRCnt(2) );
     }
 }
diff --git a/cdimg/DATA/LEVELS/LEVEL1.PLT b/cdimg/DATA/LEVELS/LEVEL1.PLT
index ef29b6e..51f4ca5 100644
--- a/cdimg/DATA/LEVELS/LEVEL1.PLT
+++ b/cdimg/DATA/LEVELS/LEVEL1.PLT
@@ -11,9 +11,19 @@ ARRIVAL;PHX2015;100;00:10;0;360
 ARRIVAL;PHX2016;100;00:40;0;360
 ARRIVAL;PHX2017;100;00:50;0;360
 ARRIVAL;PHX2018;100;01:40;0;360
-ARRIVAL;PHX2018;100;01:20;0;360
-ARRIVAL;PHX2018;100;02:00;0;360
+ARRIVAL;PHX2019;100;01:20;0;360
+ARRIVAL;PHX2020;100;02:00;0;360
+ARRIVAL;PHX2021;100;00:05;0;360
+ARRIVAL;PHX2022;100;00:15;0;360
+ARRIVAL;PHX2023;100;00:45;0;360
+ARRIVAL;PHX2024;100;01:45;0;360
+ARRIVAL;PHX2025;100;01:20;0;360
+ARRIVAL;PHX2026;100;01:10;0;360
 DEPARTURE;PHX1000;100;00:05;19;180
+DEPARTURE;PHX1001;100;00:15;19;180
+DEPARTURE;PHX1002;100;00:30;19;180
+DEPARTURE;PHX1003;100;00:45;19;180
+DEPARTURE;PHX1004;100;01:10;19;180
 DEPARTURE;PHX1280;100;01:30;19;180
 DEPARTURE;PHX1332;100;00:50;21;180
 DEPARTURE;PHX1333;100;01:00;19;180
diff --git a/cdimg/SYSTEM.CNF b/cdimg/SYSTEM.CNF
index 6046a93..c803e3e 100644
--- a/cdimg/SYSTEM.CNF
+++ b/cdimg/SYSTEM.CNF
@@ -1,4 +1,4 @@
 BOOT = cdrom:\AIRPORT.EXE;1
 TCB = 4
-EVENT = 6
+EVENT = 7
 STACK = 801FF800