diff --git a/games/breakout/ball.c b/games/breakout/ball.c
index 692d196..5599640 100644
--- a/games/breakout/ball.c
+++ b/games/breakout/ball.c
@@ -18,9 +18,30 @@
 
 #include "ball.h"
 
+/* internal functions */
+
+static void ball_spawn (ball_t *in_ball, uint16_t in_x, uint16_t in_y, int16_t in_dir_x, int16_t in_dir_y)
+{
+	in_ball->x = in_x;
+	in_ball->y = in_y;
+	in_ball->dir_x = in_dir_x;
+	in_ball->dir_y = in_dir_y;
+}
+
+static void ball_die (ball_t *in_b)
+{
+	in_b->strength--;
+
+	/* respawn ball with random direction */
+	if (in_b->strength)
+	{
+		print_ballsleft(in_b);
+		ball_spawn_default (in_b);
+	}
+}
+
 /* modify a vecotor according to given type of bouncing */
-void bounce_rand_vector (ball_t *in_b, uint8_t in_bouncetype);
-void bounce_rand_vector (ball_t *in_b, uint8_t in_bouncetype)
+static void bounce_rand_vector (ball_t *in_b, uint8_t in_bouncetype)
 {
 	uint8_t rval = random8();
 	
@@ -57,6 +78,9 @@ void bounce_rand_vector (ball_t *in_b, uint8_t in_bouncetype)
 		in_b->dir_y = 217;
 }
 
+
+/* interface functions */
+
 void ball_think (ball_t *b)
 {
 	int8_t proj_x, proj_y, bounce, tmp;
@@ -141,18 +165,6 @@ void ball_think (ball_t *b)
 	b->y += b->dir_y;
 	b->x += b->dir_x;
 }
-	
-void ball_die (ball_t *in_b)
-{
-	in_b->strength--;
-
-	/* respawn ball with random direction */
-	if (in_b->strength)
-	{
-		print_ballsleft(in_b);
-		ball_spawn_default (in_b);
-	}
-}
 
 void ball_draw (ball_t *b)
 {
@@ -163,14 +175,6 @@ void ball_draw (ball_t *b)
 	setpixel (p, 3);
 }
 
-void ball_spawn (ball_t *in_ball, uint16_t in_x, uint16_t in_y, int16_t in_dir_x, int16_t in_dir_y)
-{
-	in_ball->x = in_x;
-	in_ball->y = in_y;
-	in_ball->dir_x = in_dir_x;
-	in_ball->dir_y = in_dir_y;
-}
-
 void ball_spawn_default (ball_t *in_b)
 {
 	int16_t xdir;
diff --git a/games/breakout/ball.h b/games/breakout/ball.h
index 31727fd..c32e0e4 100644
--- a/games/breakout/ball.h
+++ b/games/breakout/ball.h
@@ -30,15 +30,10 @@ typedef struct
 	uint8_t strength;
 } ball_t;
 
-void ball_spawn (ball_t *in_ball, uint16_t in_x, uint16_t in_y, int16_t in_dir_x, int16_t in_dir_y);
-
 /* @description Called once per game tick. Move the ball further along it's vector.
  */
 void ball_think (ball_t *in_ball);
 
-
-void ball_die (ball_t *in_b);
-
 void ball_draw (ball_t *);
 
 void ball_spawn_default (ball_t *in_b);
diff --git a/games/breakout/level.c b/games/breakout/level.c
index d1c5ff6..a11b6e9 100644
--- a/games/breakout/level.c
+++ b/games/breakout/level.c
@@ -20,9 +20,10 @@
 
 static uint16_t maxscore;
 
+/* internal functions */
+
 /* real level definition */
-game_field_t level_field (uint8_t in_x, uint8_t in_y, uint8_t in_lvl);
-game_field_t level_field (uint8_t in_x, uint8_t in_y, uint8_t in_lvl)
+static game_field_t level_field (uint8_t in_x, uint8_t in_y, uint8_t in_lvl)
 {
 	switch (in_lvl)
 	{
@@ -79,6 +80,8 @@ game_field_t level_field (uint8_t in_x, uint8_t in_y, uint8_t in_lvl)
 	}
 }
 
+/* interface functions */
+
 void level_init (uint8_t in_levelnum)
 {
 	uint8_t x,y;
diff --git a/games/breakout/playfield.c b/games/breakout/playfield.c
index cd4abd5..7404d7d 100644
--- a/games/breakout/playfield.c
+++ b/games/breakout/playfield.c
@@ -19,6 +19,52 @@
 #include "playfield.h"
 game_field_t (*playfield)[NUM_COLS][NUM_ROWS];
 
+/* internal functions */
+
+/* this is the actual draw function for a single field
+ */
+static void draw_single_field (uint8_t in_x, uint8_t in_y, game_field_t in_f)
+{
+	pixel tmp;
+	uint8_t b;
+	switch (in_f)
+	{
+		case b1:
+			b = 1;
+		break;
+
+		case rb:
+		case b2:
+			b = 2;
+		break;
+
+		case b3:
+		case bl:
+		case bs:
+			b = 3;
+		break;
+
+		default: /* this includes freespace */
+			b = 0;
+		break;
+
+	}
+	tmp.x = in_x;
+	tmp.y = in_y;
+	setpixel (tmp, b);
+}
+
+static void brick_damage (uint8_t in_x, uint8_t in_y)
+{
+	if ((*playfield)[in_x][in_y] >= bs || (*playfield)[in_x][in_y] == 0)
+		return;
+
+	(*playfield)[in_x][in_y] -= 1;
+	score_add (1);
+}
+
+/* interface functions */
+
 void playfield_set (uint8_t in_x, uint8_t in_y, game_field_t in_field)
 {
 	if (in_x >= NUM_ROWS || in_y >= NUM_COLS)
@@ -28,15 +74,6 @@ void playfield_set (uint8_t in_x, uint8_t in_y, game_field_t in_field)
 	(*playfield)[in_x][in_y] = in_field;
 }
 
-void brick_damage (uint8_t in_x, uint8_t in_y)
-{
-	if ((*playfield)[in_x][in_y] >= bs || (*playfield)[in_x][in_y] == 0)
-		return;
-
-	(*playfield)[in_x][in_y] -= 1;
-	score_add (1);
-}
-
 uint8_t check_bounce (int8_t in_x, int8_t in_y)
 {
 	uint8_t ov = 0;
@@ -78,39 +115,6 @@ uint8_t check_bounce (int8_t in_x, int8_t in_y)
 	return ov;
 }
 
-/* this is the actual draw function for a single field
- */
-static inline void draw_single_field (uint8_t in_x, uint8_t in_y, game_field_t in_f)
-{
-	pixel tmp;
-	uint8_t b;
-	switch (in_f)
-	{
-		case b1:
-			b = 1;
-		break;
-
-		case rb:
-		case b2:
-			b = 2;
-		break;
-
-		case b3:
-		case bl:
-		case bs:
-			b = 3;
-		break;
-
-		default: /* this includes freespace */
-			b = 0;
-		break;
-		
-	}
-	tmp.x = in_x;
-	tmp.y = in_y;
-	setpixel (tmp, b);
-}
-
 void playfield_draw ()
 {
 	uint8_t x,y;
diff --git a/games/breakout/rebound.c b/games/breakout/rebound.c
index 82d0c6a..853ed69 100644
--- a/games/breakout/rebound.c
+++ b/games/breakout/rebound.c
@@ -17,7 +17,7 @@
  */
 #include "rebound.h"
 
-static uint8_t rbpos;
+uint8_t rbpos;
 
 void rebound_reflect (ball_t *b, int8_t in_x)
 {
@@ -29,17 +29,6 @@ void rebound_reflect (ball_t *b, int8_t in_x)
 	b->dir_y += rebound_reflection[tmpidx][1];
 }
 
-uint8_t rebound_getpos ()
-{
-	return (rbpos + (REBOUND_SIZE / 2));
-}
-
-void rebound_init()
-{
-	rbpos = (NUM_ROWS / 2) - (REBOUND_SIZE / 2);
-	rebound_draw();
-}
-
 void rebound_draw ()
 {
 	uint8_t i;
diff --git a/games/breakout/rebound.h b/games/breakout/rebound.h
index 10c39dd..d4716e8 100644
--- a/games/breakout/rebound.h
+++ b/games/breakout/rebound.h
@@ -19,9 +19,20 @@
 
 #ifndef REBOUND_H
 #define REBOUND_H
-void rebound_init();
 void rebound_tick(ball_t *ball);
 void rebound_draw();
-uint8_t rebound_getpos();
+
+extern unsigned char rbpos;
+inline static uint8_t rebound_getpos ()
+{
+	return (rbpos + (REBOUND_SIZE / 2));
+}
+
+inline static void rebound_init()
+{
+	rbpos = (NUM_ROWS / 2) - (REBOUND_SIZE / 2);
+	rebound_draw();
+}
+
 void rebound_reflect(ball_t *b, int8_t in_x);
 #endif /* REBOUND_H */
diff --git a/games/breakout/score.c b/games/breakout/score.c
index 16a726a..ca08493 100644
--- a/games/breakout/score.c
+++ b/games/breakout/score.c
@@ -16,14 +16,5 @@
  *
  */
 #include "score.h"
-static uint16_t score = 0;
+unsigned short score = 0;
 
-void score_add (uint8_t in_score)
-{
-	score += in_score;
-}
-
-uint16_t score_get()
-{
-	return score;
-}
diff --git a/games/breakout/score.h b/games/breakout/score.h
index bbb51f9..affac10 100644
--- a/games/breakout/score.h
+++ b/games/breakout/score.h
@@ -20,6 +20,14 @@
 #ifndef SCORE_H
 #define SCORE_H
 
-void score_add(uint8_t);
-uint16_t score_get();
+extern unsigned short score;
+inline static void score_add (uint8_t in_score)
+{
+	score += in_score;
+}
+
+inline static unsigned short score_get()
+{
+	return score;
+}
 #endif
diff --git a/menu/menu.c b/menu/menu.c
index 6255cab..121380d 100644
--- a/menu/menu.c
+++ b/menu/menu.c
@@ -91,7 +91,7 @@ static uint8_t menu_getIconPixel(uint8_t item, uint8_t x, uint8_t y)
 	{
 		// return pixel
 		return (0x80 >> x) &
-			pgm_read_word(&_game_descriptors_start__[item].icon[y]);
+			pgm_read_byte(&_game_descriptors_start__[item].icon[y]);
 	}
 	else
 	{
diff --git a/scrolltext/scrolltext3.c b/scrolltext/scrolltext3.c
index 2e3ea8c..b0aa2e9 100644
--- a/scrolltext/scrolltext3.c
+++ b/scrolltext/scrolltext3.c
@@ -47,13 +47,13 @@ Wenn der Command abgearbeitet ist wird automatisch das nächste Token eingelesen
 
 unsigned char (*text_pixmap)[NUM_ROWS][LINEBYTES];
 
-void text_setpixel(pixel p, unsigned char value ){
+static void text_setpixel(pixel p, unsigned char value ){
 	if(value){
 		(*text_pixmap)[p.y%NUM_ROWS][p.x/8] |= shl_table[p.x%8];
 	}
 }
 
-void clear_text_pixmap(unsigned char value){
+static void clear_text_pixmap(unsigned char value){
 	unsigned char y, z;
 	for(y=NUM_ROWS;y--;){
 		for(z=LINEBYTES;z--;){
@@ -151,7 +151,7 @@ void showBlob(blob_t * blob){
 #define PW(a) pgm_read_word(&(a))
 #define PB(a) pgm_read_byte(&(a))
 
-unsigned int getLen(blob_t *blob) {
+static unsigned int getLen(blob_t *blob) {
 	unsigned char glyph;
 	unsigned int strLen = 0;
 	unsigned char * str = (unsigned char*)blob->str;
@@ -166,7 +166,7 @@ unsigned int getLen(blob_t *blob) {
 }
 
 
-unsigned int getnum(blob_t * blob){
+static unsigned int getnum(blob_t * blob){
 	unsigned int num=0;
 	unsigned char gotnum = 0;
 
@@ -523,9 +523,9 @@ void scrolltext(char *str) {
 
 	text_pixmap = malloc(NUM_ROWS * LINEBYTES);
 
-  if(scrolltext_text[0] == 0){
-    strcpy_P(scrolltext_text, default_text);
-  }
+	if(scrolltext_text[0] == 0){
+		strcpy_P(scrolltext_text, default_text);
+	}
 	memcpy(tmp_str, str, SCROLLTEXT_BUFFER_SIZE);
 
 	blob_t *startblob=0, *aktblob, *nextblob=0;