diff --git a/game-ctrl/game.c b/game-ctrl/game.c
index fc202f1..756f202 100644
--- a/game-ctrl/game.c
+++ b/game-ctrl/game.c
@@ -12,12 +12,13 @@
 #include "buttons.h"
 
 
-#define GAME_CYCLE_TIME 100
+#define GAME_CYCLE_TIME 50
 #define GAMEOVER_DELAY 10
+#define MAX_LEVEL 20
 
 
 static uint8_t delayFactor(uint8_t level) {
-  return 11 - level;
+  return MAX_LEVEL + 1 - level;
 }
 
 typedef enum {
@@ -36,6 +37,7 @@ void gameExec(void *handle) {
   static uint8_t rowIndex;
   static uint8_t proceedDelay;
   static uint8_t level;
+  static uint16_t filledLines;
   static uint16_t score;
   static bool newHighScoreAchieved;
 
@@ -46,6 +48,7 @@ void gameExec(void *handle) {
       canvasClear();
       soundCtrl(SOUND_START);
       level = 1;
+      filledLines = 0;
       score = 0;
       newHighScoreAchieved = false;
       phase = e_Phase_Game;
@@ -118,9 +121,9 @@ void gameExec(void *handle) {
   }
 // --- engine end ---------------------------------------------------------
 
+  bool wipedLines = false;
   canvasShow();
   if (phase == e_Phase_Game) {
-    uint8_t wipeCnt = 0;
     for (uint8_t r = 0; r < CANVAS_HEIGHT; r++) {
       if (canvasIsRowFilled(r)) {
         score += level;
@@ -131,14 +134,24 @@ void gameExec(void *handle) {
         displaySetValue(score);
         canvasWipeRow(r);
         canvasShow();
-        wipeCnt += 1;
+        wipedLines = true;
+        filledLines += 1;
       }
     }
-    if (wipeCnt != 0) {
-      soundCtrl(SOUND_FANFARE); 
-    }
   }
 
+  if (wipedLines) {
+    soundCtrl(SOUND_PLING);
+  }
+
+  if (wipedLines && (filledLines > 0) && ((filledLines % 10) == 0)) {
+    if (level < MAX_LEVEL) {
+      level += 1;
+    }
+    soundCtrl(SOUND_FANFARE); 
+  }
+
+
   if (isGameActive()) {
     displaySetValue(score);
   } else {
diff --git a/sound-driver/Makefile b/sound-driver/Makefile
index 957525a..fa14a2a 100644
--- a/sound-driver/Makefile
+++ b/sound-driver/Makefile
@@ -13,7 +13,7 @@ CFLAGS+= -g3 -ggdb -gdwarf-2
 
 LDFLAGS=-mmcu=$(MCU) -L $(TOOLCHAIN_PREFIX)/include
 
-$(ARTIFACT).elf:	main.o scheduler.o spi.o spi_init.o sequencer.o melody_tetris.o melody_tusch1.o psg.o mute.o
+$(ARTIFACT).elf:	main.o scheduler.o spi.o spi_init.o sequencer.o melody_tetris.o melody_tusch1.o psg.o mute.o melody_pling.o
 	$(CC) -o $@ $(LDFLAGS) $^
 	$(OBJDUMP) -D $(ARTIFACT).elf > $(ARTIFACT).txt
 
diff --git a/sound-driver/melody_pling.c b/sound-driver/melody_pling.c
new file mode 100644
index 0000000..6b76b56
--- /dev/null
+++ b/sound-driver/melody_pling.c
@@ -0,0 +1,29 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include "psg.h"
+#include "sequencer.h"
+#include "scheduler.h"
+
+const t_tone plingVoice1[] = {
+  { .octave = e_O_5,    .note = e_C,     .length = e_L_1_4,     .legato = false, .staccato = true  },
+  { .octave = e_O_5,    .note = e_G,     .length = e_L_1_4,     .legato = false, .staccato = true  },
+
+  { .octave = e_O_Null, .note = e_Null,  .length = e_L_SyncMark,.legato = false, .staccato = false },
+  { .octave = e_O_Null, .note = e_Null,  .length = e_L_StopMark,.legato = false, .staccato = false },
+
+  { .octave = e_O_Null, .note = e_Null,  .length = e_L_EndMark, .legato = false, .staccato = false },
+};
+
+t_melodies pling = {
+  .melodies = { { .chip = 1, .amplitude = 12, .tones = plingVoice1 } },
+  .numOfMelodies = 1,
+  .pace = 200,
+  .slotMask = 0x02
+};
+
+void playPling() {
+  sequencerPlayMelodies(&pling);
+}
+
+
+
diff --git a/sound-driver/melody_pling.h b/sound-driver/melody_pling.h
new file mode 100644
index 0000000..6a0f1f5
--- /dev/null
+++ b/sound-driver/melody_pling.h
@@ -0,0 +1,8 @@
+#ifndef _MELODY_PLING_H_
+#define _MELODY_PLING_H_
+
+
+void playPling();
+
+
+#endif // _MELODY_PLING_H_
diff --git a/sound-driver/melody_tetris.c b/sound-driver/melody_tetris.c
index 340eb3f..30091fb 100644
--- a/sound-driver/melody_tetris.c
+++ b/sound-driver/melody_tetris.c
@@ -930,11 +930,18 @@ t_melodies tetrisTheme = {
 };
 
 void playMelodyTetris() {
+  tetrisTheme.pace = 160; // reset to start value each time
   sequencerPlayMelodies(&tetrisTheme);
 }
 
+void playMelodyTetrisFaster() {
+  tetrisTheme.pace += 10;
+  sequencerChangePace(&tetrisTheme);
+}
+
 void stopMelodyTetris() {
   sequencerStopMelodies(&tetrisTheme);
 }
 
 
+
diff --git a/sound-driver/melody_tetris.h b/sound-driver/melody_tetris.h
index 72a43fc..f9d7394 100644
--- a/sound-driver/melody_tetris.h
+++ b/sound-driver/melody_tetris.h
@@ -4,6 +4,6 @@
 
 void playMelodyTetris();
 void stopMelodyTetris();
-
+void playMelodyTetrisFaster();
 
 #endif // _MELODY_TETRIS_H_
diff --git a/sound-driver/melody_tusch1.c b/sound-driver/melody_tusch1.c
index 5bb2d79..a596ab2 100644
--- a/sound-driver/melody_tusch1.c
+++ b/sound-driver/melody_tusch1.c
@@ -3,6 +3,7 @@
 #include "psg.h"
 #include "sequencer.h"
 #include "scheduler.h"
+#include "melody_tetris.h"
 
 const t_tone tusch1voice1[] = {
   { .octave = e_O_5,    .note = e_C,     .length = e_L_1_4,     .legato = false, .staccato = true  },
@@ -79,6 +80,7 @@ t_melodies tusch1 = {
 
 void playTusch1() {
   sequencerPlayMelodies(&tusch1);
+  playMelodyTetrisFaster();
 }
 
 
diff --git a/sound-driver/sequencer.c b/sound-driver/sequencer.c
index 8c0b7e1..9ffc25c 100644
--- a/sound-driver/sequencer.c
+++ b/sound-driver/sequencer.c
@@ -127,3 +127,7 @@ void sequencerStopMelodies(t_melodies *melodies) {
   schDel(melodies->taskId);
 }
 
+void sequencerChangePace(t_melodies *melodies) {
+  melodies->quarterLength = 60000 / melodies->pace / SEQUENCER_PERIOD; // duration of a 1/4 tone in ms
+}
+
diff --git a/sound-driver/sequencer.h b/sound-driver/sequencer.h
index 0eb374b..bdb4fd6 100644
--- a/sound-driver/sequencer.h
+++ b/sound-driver/sequencer.h
@@ -64,5 +64,6 @@ typedef struct {
 void sequencerInit();
 void sequencerPlayMelodies(t_melodies *melodies);
 void sequencerStopMelodies(t_melodies *melodies);
+void sequencerChangePace(t_melodies *melodies); 
 
 #endif // _SEQUENCER_H_
diff --git a/sound-driver/soundCodes.h b/sound-driver/soundCodes.h
index b5af55c..72f4824 100644
--- a/sound-driver/soundCodes.h
+++ b/sound-driver/soundCodes.h
@@ -9,6 +9,6 @@
 #define SOUND_FANFARE 0x10
 #define SOUND_LOCK 0x20
 #define SOUND_MOTION 0x40
-#define SOUND_SPEED_UP 0x80
+#define SOUND_PLING 0x80
 
 #endif // _SOUND_CODES_H_
diff --git a/sound-driver/spi.S b/sound-driver/spi.S
index c61617f..c8d4864 100644
--- a/sound-driver/spi.S
+++ b/sound-driver/spi.S
@@ -52,10 +52,10 @@ spiCmdHandler_7:
   ;; insert a call here
   bic     #SOUND_MOTION, &cmd
 spiCmdHandler_8:
-  bit     #SOUND_SPEED_UP, &cmd
+  bit     #SOUND_PLING, &cmd
   jz      spiCmdHandler_end
-  ;; insert a call here
-  bic     #SOUND_SPEED_UP, &cmd
+  call    #playPling
+  bic     #SOUND_PLING, &cmd
 spiCmdHandler_end:
   ret