diff --git a/csrc/u8x8_d_ssd1322.c b/csrc/u8x8_d_ssd1322.c
index 0d26165c..ce7d96f8 100644
--- a/csrc/u8x8_d_ssd1322.c
+++ b/csrc/u8x8_d_ssd1322.c
@@ -32,6 +32,9 @@
   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
 
 
+  SSD1322: 
+    480 x 128 dot matrix
+    16 gray scale
   
   
 */
diff --git a/csrc/u8x8_d_ssd1325.c b/csrc/u8x8_d_ssd1325.c
index 97593936..7090791c 100644
--- a/csrc/u8x8_d_ssd1325.c
+++ b/csrc/u8x8_d_ssd1325.c
@@ -30,6 +30,9 @@
   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
+
+  SSD1325:
+    128 x 80, 16 Gray Scale Dot Matrix
   
 */
 
diff --git a/sys/arduino/u8g2_page_buffer/LittleRookChess/LittleRookChess.hex b/sys/arduino/u8g2_page_buffer/LittleRookChess/LittleRookChess.hex
index bc5e2c5a..20b2e17f 100644
--- a/sys/arduino/u8g2_page_buffer/LittleRookChess/LittleRookChess.hex
+++ b/sys/arduino/u8g2_page_buffer/LittleRookChess/LittleRookChess.hex
@@ -8,9 +8,9 @@
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+:1000A0000C9469040C9469040C9469049D17A017BE
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+:1000C000AC17B217B617C117BC17080B0002020213
 :1000D00001000904000001020200000524001001D3
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@@ -183,8 +183,8 @@
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@@ -377,11 +377,11 @@
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@@ -479,21 +479,21 @@
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@@ -511,7 +511,7 @@
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 :1045300082E00E94CA0E0E947B0C0E941C16E09131
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 :04471000F894FFCF4B
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@@ -1149,13 +1149,13 @@
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+:1048240000000000083E1C08000000000050183C76
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+:1048440018321AC718A218AD18CB18E918000000BE
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diff --git a/sys/arduino/u8g2_page_buffer/SpaceTrash/SpaceTrash.ino b/sys/arduino/u8g2_page_buffer/SpaceTrash/SpaceTrash.ino
index 803bc84b..3d7aa104 100644
--- a/sys/arduino/u8g2_page_buffer/SpaceTrash/SpaceTrash.ino
+++ b/sys/arduino/u8g2_page_buffer/SpaceTrash/SpaceTrash.ino
@@ -49,7 +49,7 @@
 // Please update the pin numbers according to your setup. Use U8X8_PIN_NONE if the reset pin is not connected
 //U8G2_NULL u8g2(U8G2_R0);	// null device, a 8x8 pixel display which does nothing
 //U8G2_SSD1306_128X64_NONAME_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
-//U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 12, /* dc=*/ 4, /* reset=*/ 6);	// Arduboy (Production, Kickstarter Edition)
+U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 12, /* dc=*/ 4, /* reset=*/ 6);	// Arduboy (Production, Kickstarter Edition)
 //U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
 //U8G2_SSD1306_128X64_NONAME_1_3W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* reset=*/ 8);
 //U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
diff --git a/sys/arduino/u8g2_page_buffer/TicTacToe/Makefile.184.leonardo b/sys/arduino/u8g2_page_buffer/TicTacToe/Makefile.184.leonardo
new file mode 100644
index 00000000..69cbbb8f
--- /dev/null
+++ b/sys/arduino/u8g2_page_buffer/TicTacToe/Makefile.184.leonardo
@@ -0,0 +1,148 @@
+#
+# Makefile.184 for Arduino/AVR 
+#
+#  Note:
+#  	Display list make database: make -p -f/dev/null | less
+
+
+# Install path of the arduino software. Requires a '/' at the end.
+ARDUINO_PATH:=/home/kraus/prg/arduino-1.8.4/
+
+# Board (and prozessor) information: see $(ARDUINO_PATH)hardware/arduino/avr/boards.txt
+# Some examples:
+#	BOARD		DESCRIPTION
+#	uno			Arduino Uno
+#	atmega328	Arduino Duemilanove or Nano w/ ATmega328
+#	diecimila		Arduino Diecimila, Duemilanove, or Nano w/ ATmega168
+#	mega		Arduino Mega
+#	mega2560	Arduino Mega2560
+#	mini			Arduino Mini
+#	lilypad328	LilyPad Arduino w/ ATmega328  
+#	leonardo		Leonardo, Arduboy, Feather AVR
+BOARD:=leonardo
+
+# The unix device where we can reach the arduino board
+# Uno: /dev/ttyACM0
+# Duemilanove: /dev/ttyUSB0
+AVRDUDE_PORT:=/dev/ttyACM0
+
+
+
+SRC_DIRS=$(ARDUINO_PATH)hardware/arduino/avr/cores/arduino/
+SRC_DIRS+=$(ARDUINO_PATH)hardware/arduino/avr/libraries/SPI/src/
+SRC_DIRS+=$(ARDUINO_PATH)hardware/arduino/avr/libraries/SPI/src/utility/
+SRC_DIRS+=$(ARDUINO_PATH)hardware/arduino/avr/libraries/Wire/src/
+SRC_DIRS+=$(ARDUINO_PATH)hardware/arduino/avr/libraries/Wire/src/utility/
+SRC_DIRS+=../../../../csrc/
+SRC_DIRS+=../../../../cppsrc/
+
+#=== suffixes ===
+.SUFFIXES: .elf .hex .ino
+
+#=== identify user files ===
+INOSRC:=$(shell ls *.ino)
+TARGETNAME=$(basename $(INOSRC))
+
+#=== internal names ===
+LIBNAME:=$(TARGETNAME).a
+ELFNAME:=$(TARGETNAME).elf
+HEXNAME:=$(TARGETNAME).hex
+BINNAME:=$(TARGETNAME).bin
+DISNAME:=$(TARGETNAME).dis
+MAPNAME:=$(TARGETNAME).map
+
+#=== replace standard tools ===
+CC:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-gcc
+CXX:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-g++
+AR:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-gcc-ar
+OBJCOPY:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-objcopy
+OBJDUMP:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-objdump
+SIZE:=$(ARDUINO_PATH)hardware/tools/avr/bin/avr-size
+
+AVRDUDE = $(ARDUINO_PATH)hardware/tools/avr/bin/avrdude
+
+
+#=== get values from boards.txt ===
+BOARDS_TXT:=$(ARDUINO_PATH)hardware/arduino/avr/boards.txt
+
+# get the MCU value from the $(BOARD).build.mcu variable. For the atmega328 board this is atmega328p
+MCU:=$(shell sed -n -e "s/$(BOARD).build.mcu=\(.*\)/\1/p" $(BOARDS_TXT))
+# get the F_CPU value from the $(BOARD).build.f_cpu variable. For the atmega328 board this is 16000000
+F_CPU:=$(shell sed -n -e "s/$(BOARD).build.f_cpu=\(.*\)/\1/p" $(BOARDS_TXT))
+# get variant subfolder
+VARIANT:=$(shell sed -n -e "s/$(BOARD).build.variant=\(.*\)/\1/p" $(BOARDS_TXT))
+UPLOAD_SPEED:=$(shell sed -n -e "s/$(BOARD).upload.speed=\(.*\)/\1/p" $(BOARDS_TXT))
+# get the AVRDUDE_PROGRAMMER value from the $(BOARD).upload.protocol variable. For the atmega328 board this is stk500
+UPLOAD_PROTOCOL:=$(shell sed -n -e "s/$(BOARD).upload.protocol=\(.*\)/\1/p" $(BOARDS_TXT))
+# use stk500v1, because stk500 will default to stk500v2
+#UPLOAD_PROTOCOL:=stk500v1
+
+AVRDUDE_FLAGS = -V -F
+AVRDUDE_FLAGS += -C $(ARDUINO_PATH)/hardware/tools/avr/etc/avrdude.conf
+AVRDUDE_FLAGS += -p $(MCU)
+AVRDUDE_FLAGS += -P $(AVRDUDE_PORT)
+AVRDUDE_FLAGS += -c $(UPLOAD_PROTOCOL) 
+AVRDUDE_FLAGS += -b $(UPLOAD_SPEED)
+AVRDUDE_FLAGS += -U flash:w:$(HEXNAME)
+
+#=== get all include dirs ===
+INC_DIRS:=. $(SRC_DIRS) $(ARDUINO_PATH)hardware/arduino/avr/variants/$(VARIANT)
+INC_OPTS:=$(addprefix -I,$(INC_DIRS))
+
+#=== get all source files ===
+CSRC:=$(shell ls $(addsuffix *.c,$(SRC_DIRS)) 2>/dev/null) 
+CPPSRC:=$(shell ls $(addsuffix *.cpp,$(SRC_DIRS)) 2>/dev/null)
+
+#=== get all obj files ===
+COBJ:=$(CSRC:.c=.o)
+CPPOBJ:=$(CPPSRC:.cpp=.o)
+OBJ:=$(COBJ) $(CPPOBJ) $(TARGETNAME).o
+
+
+#=== options ===
+
+COMMON_FLAGS = -g -Os -DF_CPU=$(F_CPU) -mmcu=$(MCU) 
+COMMON_FLAGS +=-DARDUINO=10800 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR
+COMMON_FLAGS +=-DUSB_VID=0x2341 -DUSB_PID=0x8036
+COMMON_FLAGS +=-ffunction-sections -fdata-sections -MMD -flto -fno-fat-lto-objects
+COMMON_FLAGS +=$(INC_OPTS)
+CFLAGS:=$(COMMON_FLAGS) -std=gnu99 -Wstrict-prototypes  -Wall -Wextra
+CXXFLAGS:=$(COMMON_FLAGS) -std=gnu++11 -fpermissive -fno-exceptions -fno-threadsafe-statics
+LDFLAGS:=-g -Os  -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=$(MCU)
+LDLIBS:=-lm
+
+all: $(HEXNAME) $(DISNAME)
+	$(SIZE) $(ELFNAME)
+
+.PHONY: debug
+debug: 
+	@echo $(MCU) $(F_CPU) $(VARIANT) $(UPLOAD_SPEED) $(UPLOAD_PROTOCOL)
+	@echo $(SRC_DIRS)
+	@echo $(CSRC)
+	@echo $(CPPSRC)
+	@echo $(INC_OPTS)
+
+.PHONY: clean
+clean:
+	$(RM) $(OBJ) $(HEXNAME) $(ELFNAME) $(LIBNAME) $(DISNAME) $(MAPNAME) $(BINNAME)
+
+.PHONY: upload
+upload: $(HEXNAME)
+	stty -F $(AVRDUDE_PORT) 1200 raw ignbrk hup && sleep 3
+	$(AVRDUDE) $(AVRDUDE_FLAGS)
+
+# implicit rules
+.ino.cpp:
+	@cp $< $@
+	
+.elf.hex:
+	@$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+# explicit rules
+$(ELFNAME): $(LIBNAME)($(OBJ)) 
+	$(LINK.o) $(LFLAGS) $(LIBNAME) $(LDLIBS) -o $@
+
+$(DISNAME): $(ELFNAME)
+	$(OBJDUMP) -D -S $< > $@
+
+	
diff --git a/sys/arduino/u8g2_page_buffer/TicTacToe/TicTacToe.ino b/sys/arduino/u8g2_page_buffer/TicTacToe/TicTacToe.ino
new file mode 100644
index 00000000..2dfca6ac
--- /dev/null
+++ b/sys/arduino/u8g2_page_buffer/TicTacToe/TicTacToe.ino
@@ -0,0 +1,507 @@
+/*
+
+  TicTacToe.ino
+  
+  Tic Tac Toe (three in a row) game
+
+  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
+
+  Copyright (c) 2018, olikraus@gmail.com
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without modification, 
+  are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice, this list 
+    of conditions and the following disclaimer.
+    
+  * Redistributions in binary form must reproduce the above copyright notice, this 
+    list of conditions and the following disclaimer in the documentation and/or other 
+    materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
+
+*/
+
+#include <Arduino.h>
+#include <U8g2lib.h>
+
+
+
+
+/*=== ARDUBOY Production, Kickstarter Edition ===*/
+U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 12, /* dc=*/ 4, /* reset=*/ 6);	// Arduboy (Production, Kickstarter Edition)
+
+void setup(void) 
+{
+  u8g2.begin(/*Select=*/ 7, /*Right/Next=*/ A1, /*Left/Prev=*/ A2, /*Up=*/ A0, /*Down=*/ A3, /*Home/Cancel=*/ 8); // Arduboy 10 (Production)
+}
+
+#define FLOW_CHART_DELAY 1500
+
+u8g2_uint_t flow_chart_x_offset = 68;
+u8g2_uint_t flow_chart_y_offset = 0;
+
+void draw_text_box(u8g2_uint_t x, u8g2_uint_t y, const char *s, uint8_t bold)
+{
+  x += flow_chart_x_offset;
+  y += flow_chart_y_offset;
+
+  u8g2.setFont(u8g2_font_5x7_mr);
+  u8g2.drawFrame(x, y, 58, 10);
+  if ( bold )
+    u8g2.drawFrame(x-1, y-1, 58+2, 10+2);
+  
+  u8g2.drawStr(x+2, y+7, s);
+}
+
+void draw_box_vline(u8g2_uint_t x, u8g2_uint_t y0, u8g2_uint_t y1)
+{
+  x += flow_chart_x_offset;
+  x += 58/2;
+  y0 += flow_chart_y_offset;
+  y1 += flow_chart_y_offset;
+  u8g2.drawVLine(x, y0, y1-y0+1);
+}
+
+
+
+void draw_flow_chart(uint8_t pos)
+{
+  flow_chart_y_offset = 0;
+  if ( pos > 3 )
+  {
+    flow_chart_y_offset -= (pos-3)*20;
+  }
+  draw_text_box(0, 0, "init game", pos == 1);
+  draw_box_vline(0, 10, 20);
+  draw_text_box(0, 20, "show board", pos == 2);
+  draw_box_vline(0, 30, 40);
+  draw_text_box(0, 40, "player move", pos == 3);
+  draw_box_vline(0, 50, 60);
+  draw_text_box(0, 60, "show board", pos == 4);
+  draw_box_vline(0, 70, 80);
+  draw_text_box(0, 80, "check game", pos == 5);
+  draw_box_vline(0, 90, 100);
+  draw_text_box(0, 100, "ai move", pos == 6);
+  draw_box_vline(0, 110, 120);
+  draw_text_box(0, 120, "show board", pos == 7);
+  draw_box_vline(0, 130, 140);
+  draw_text_box(0, 140, "check game", pos == 8);
+  draw_box_vline(0, 150, 160);
+  draw_text_box(0, 160, "result", pos == 9);
+}
+
+void show_flow_chart(uint8_t pos)
+{
+    u8g2.firstPage();
+    do 
+    {
+      yield();
+      draw_flow_chart(pos);
+    } while ( u8g2.nextPage() );
+    delay(FLOW_CHART_DELAY);
+}
+
+
+/*==============================================*/
+
+#define GRID_X_OFFSET 2
+#define GRID_Y_OFFSET 2
+#define CELL_WIDTH 17
+#define CELL_HEIGHT 17
+#define CELL_FRAME_WIDTH 3
+
+uint8_t cursor_position; /* 0...8 */
+u8g2_uint_t cell_x, cell_y;
+
+/* calculate the cell position, return pixel position in global variables cell_x and cell_y */
+void calc_cell_position(uint8_t x, uint8_t y )
+{
+  cell_x = x;
+  cell_x*=CELL_WIDTH+CELL_FRAME_WIDTH;
+  cell_x+= GRID_X_OFFSET;
+  cell_y = y;
+  cell_y *=CELL_HEIGHT+CELL_FRAME_WIDTH;
+  cell_y +=GRID_Y_OFFSET;
+}
+
+void draw_grid(void)
+{
+  u8g2_uint_t x, y;
+  x = GRID_X_OFFSET+CELL_WIDTH;  
+  u8g2.drawVLine(x+1, GRID_Y_OFFSET, CELL_HEIGHT*3+CELL_FRAME_WIDTH*2);
+  x += CELL_WIDTH+CELL_FRAME_WIDTH;
+  u8g2.drawVLine(x+1, GRID_Y_OFFSET, CELL_HEIGHT*3+CELL_FRAME_WIDTH*2);
+
+  y = GRID_Y_OFFSET+CELL_HEIGHT;  
+  u8g2.drawHLine(GRID_X_OFFSET, y+1, CELL_WIDTH*3+CELL_FRAME_WIDTH*2);
+  y += CELL_HEIGHT+CELL_FRAME_WIDTH;
+  u8g2.drawHLine(GRID_X_OFFSET, y+1, CELL_WIDTH*3+CELL_FRAME_WIDTH*2);
+}
+
+
+void draw_cursor(void)
+{
+  u8g2_uint_t x, y;
+  x = cursor_position % 3;
+  y = cursor_position / 3;
+  calc_cell_position(x, y );
+  u8g2.drawFrame(cell_x, cell_y, CELL_WIDTH, CELL_HEIGHT);
+  u8g2.drawFrame(cell_x+1, cell_y+1, CELL_WIDTH-2, CELL_HEIGHT-2);
+}
+
+/*==============================================*/
+
+#define FELD_NICHT_BELEGT 0
+#define FELD_MARKIERT_DURCH_SPIELER 1
+#define FELD_MARKIERT_DURCH_COMPUTER 2
+
+int spielfeld[3][3];
+
+
+int gewinner = FELD_NICHT_BELEGT;
+
+/*==============================================*/
+/* vorbelegung game_initalisierung */
+void game_init(void)
+{
+  int x, y;
+  
+  show_flow_chart(1);
+  
+  gewinner = FELD_NICHT_BELEGT;
+  for( y = 0; y < 3; y = y + 1 )
+  {
+    for( x = 0; x < 3; x = x + 1 )
+    {
+      spielfeld[y][x] = FELD_NICHT_BELEGT;
+    }
+  }
+}
+
+/*==============================================*/
+/* "game engine" */
+
+void draw_board(void)
+{
+  int x, y;
+  for( y = 0; y < 3; y = y + 1 )
+  {
+    for( x = 0; x < 3; x = x + 1 )
+    {
+      if ( spielfeld[y][x] == FELD_NICHT_BELEGT )
+      {
+	  /* nichts anzeigen */
+      }
+      if ( spielfeld[y][x] == FELD_MARKIERT_DURCH_SPIELER )
+      {
+	calc_cell_position(x, y);
+	u8g2.drawLine(cell_x, cell_y, cell_x+CELL_WIDTH-1, cell_y+CELL_HEIGHT-1);
+	u8g2.drawLine(cell_x+CELL_WIDTH-1, cell_y, cell_x, cell_y+CELL_HEIGHT-1);
+      }
+      if ( spielfeld[y][x] == FELD_MARKIERT_DURCH_COMPUTER )
+      {
+	calc_cell_position(x, y);
+	u8g2.drawCircle(cell_x+CELL_WIDTH/2, cell_y+CELL_HEIGHT/2, CELL_HEIGHT/2);
+      }
+    }	/* for x */
+  } /* for y */
+}
+
+void draw_grid_board(void)
+{
+  draw_grid();
+  draw_board();
+}
+
+void show_board(uint8_t flow_chart_pos)
+{
+    u8g2.firstPage();
+    do 
+    {
+      yield();
+      draw_flow_chart(flow_chart_pos);
+      draw_grid_board();
+      draw_cursor();
+    } while ( u8g2.nextPage() );
+    delay(FLOW_CHART_DELAY);
+}
+
+/*==============================================*/
+/* Benitzerschnittstelle (User Interface) */
+
+void zug_spieler(void)
+{
+  static uint8_t keycode = 0;
+  int x;
+  int y;
+  int zaehler = 0;
+  
+  for(;;)   /* check valid entry */
+  {
+    for(;;)	/* cursor movement loop */
+    {
+      keycode = 0;
+      u8g2.firstPage();
+      do 
+      {
+	draw_flow_chart(3);
+	draw_grid_board();
+	draw_cursor();
+	if ( keycode == 0 )
+	  keycode = u8g2.getMenuEvent();
+      } while ( u8g2.nextPage() );
+
+      while ( keycode == 0 )
+      {
+	yield();
+	keycode = u8g2.getMenuEvent();
+      }
+
+      if ( keycode == U8X8_MSG_GPIO_MENU_DOWN )
+      {
+	cursor_position += 3;
+	if ( cursor_position > 9 )
+	  cursor_position -= 9;
+      }
+
+      if ( keycode == U8X8_MSG_GPIO_MENU_NEXT )
+      {
+	if ( cursor_position % 3 == 2 )
+	  cursor_position-=2;
+	else
+	  cursor_position += 1;
+      }
+
+      if ( keycode == U8X8_MSG_GPIO_MENU_UP )
+      {
+	cursor_position -= 3;
+	if ( cursor_position > 9 )
+	  cursor_position += 9;
+      }
+
+      if ( keycode == U8X8_MSG_GPIO_MENU_PREV )
+      {
+	if ( cursor_position % 3 == 0 )
+	  cursor_position+=2;
+	else
+	  cursor_position -= 1;
+      }
+      cursor_position = cursor_position % 9;
+
+      if ( keycode == U8X8_MSG_GPIO_MENU_SELECT )
+	break;
+      if ( keycode == U8X8_MSG_GPIO_MENU_HOME )
+	break;
+    }
+
+    y = cursor_position / 3;
+    x = cursor_position % 3;
+    
+    if ( spielfeld[y][x] == FELD_NICHT_BELEGT )
+    {
+      spielfeld[y][x] = FELD_MARKIERT_DURCH_SPIELER ;
+      return;
+    }
+
+    /*
+    if ( zaehler > 3 )
+    {
+      printf("Du doedl, jetzt langts aber...\n");
+      exit(1);
+    }
+    printf("Ahh, das feld ist schon belegt, nochmal...\n");
+    zaehler = zaehler + 1;
+    */
+  }
+}
+
+/*==============================================*/
+/* Künstliche Computer Intelligenz (AI NPC) */
+
+void zug_computer(void)
+{
+  int x, y;
+  
+  /* AI: saudumme AI */
+  
+  for( y = 0; y < 3; y = y + 1 )
+  {
+    for( x = 0; x < 3; x = x + 1 )
+    {
+      if ( spielfeld[y][x] == FELD_NICHT_BELEGT )
+      {
+	spielfeld[y][x] = FELD_MARKIERT_DURCH_COMPUTER;
+	return;
+      }
+    }
+  }
+}
+
+/*==============================================*/
+/* Spiel Zuende Prüfung */
+
+/* gibt 1 zurück, wenn in der zeile überall markierung gesetzt ist */
+int zeile_gewonnen(int y, int markierung)
+{
+  int x;	
+  for( x = 0; x < 3; x++ )
+  {
+    if ( spielfeld[y][x] !=  markierung )
+      return 0;
+  }
+  return 1;
+}
+
+/* gibt 1 zurück, wenn in der zeile überall markierung gesetzt ist */
+int spalte_gewonnen(int x, int markierung)
+{
+  int y;	
+  for( y = 0; y < 3; y++ )
+  {
+    if ( spielfeld[y][x] !=  markierung )
+      return 0;
+  }
+  return 1;
+}
+
+int diagonale_gewonnen(int markierung)
+{
+  int i;
+  
+  for( i = 0; i < 3; i ++ )
+  {
+    if ( spielfeld[i][i] != markierung )
+      return 0;
+  }
+  return 1;
+}
+
+int inverse_diagonale_gewonnen(int markierung)
+{
+  int i;
+  
+  for( i = 0; i < 3; i ++ )
+  {
+    if ( spielfeld[2-i][i] != markierung )
+      return 0;
+  }
+  return 1;
+}
+
+
+
+int ist_das_spiel_zuende(uint8_t flow_chart_pos)
+{
+  int i, x, y;
+  int ist_alles_voll;
+  
+  show_board(flow_chart_pos);
+
+  for( i = 0; i < 3; i ++ )
+  {
+    if ( zeile_gewonnen(i, FELD_MARKIERT_DURCH_SPIELER) )
+      gewinner = FELD_MARKIERT_DURCH_SPIELER;
+    if ( zeile_gewonnen(i, FELD_MARKIERT_DURCH_COMPUTER) )
+      gewinner = FELD_MARKIERT_DURCH_COMPUTER;
+    if ( spalte_gewonnen(i, FELD_MARKIERT_DURCH_SPIELER) )
+      gewinner = FELD_MARKIERT_DURCH_SPIELER;
+   if ( spalte_gewonnen(i, FELD_MARKIERT_DURCH_COMPUTER) )
+      gewinner = FELD_MARKIERT_DURCH_COMPUTER;
+  }
+  if ( diagonale_gewonnen(FELD_MARKIERT_DURCH_SPIELER) )
+      gewinner = FELD_MARKIERT_DURCH_SPIELER;
+  if ( diagonale_gewonnen(FELD_MARKIERT_DURCH_COMPUTER) )
+      gewinner = FELD_MARKIERT_DURCH_COMPUTER;
+
+  if ( inverse_diagonale_gewonnen(FELD_MARKIERT_DURCH_SPIELER) )
+      gewinner = FELD_MARKIERT_DURCH_SPIELER;
+  if ( inverse_diagonale_gewonnen(FELD_MARKIERT_DURCH_COMPUTER) )
+      gewinner = FELD_MARKIERT_DURCH_COMPUTER;
+  
+  if ( gewinner != FELD_NICHT_BELEGT )
+    return 1;
+
+  ist_alles_voll = 1;
+  for( y = 0; y < 3; y = y + 1 )
+  {
+    for( x = 0; x < 3; x = x + 1 )
+    {
+      if ( spielfeld[y][x] == FELD_NICHT_BELEGT )
+      {
+	ist_alles_voll = 0;
+      }
+    }
+  }
+
+
+  if ( ist_alles_voll )
+    return 1;
+    
+  return 0;
+}
+
+/*==============================================*/
+
+void zeige_ergebnis_an(void)
+{
+  u8g2.setFont(u8g2_font_helvB12_tr);
+  if ( gewinner == FELD_MARKIERT_DURCH_SPIELER )
+    u8g2.userInterfaceMessage("", "payer wins...", "", " ok ");
+  else if ( gewinner == FELD_MARKIERT_DURCH_COMPUTER )
+    u8g2.userInterfaceMessage("", "computer wins..", "", " ok ");
+  else
+    u8g2.userInterfaceMessage("", "game is a draw...", "", " ok ");
+}
+
+/*==============================================*/
+
+/* HIER IST DIE HAUPTSCHLEIFE */
+
+void game_play_loop(void)
+{
+  game_init();
+  show_board(2);
+  for(;;)
+  {
+    zug_spieler();
+    show_board(4);
+    if ( ist_das_spiel_zuende(5) )
+    {
+      break;
+      
+    } /* if */
+    show_board(6);
+    zug_computer();
+    show_board(7);
+    if ( ist_das_spiel_zuende(8) )
+    {
+      break;
+    } /* if */
+    
+  } /* for */
+  show_board(9);
+  zeige_ergebnis_an();
+  
+} /* main */
+
+
+
+void loop(void) 
+{
+  game_play_loop();
+}
+