diff --git a/src/main.cpp b/src/main.cpp
index e450a9e..90ae66c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -37,7 +37,6 @@ X X     X X
    XX XX
 */
 
-byte invaderA_1[11] = {112,24,125,182,188,60,188,182,125,24,112};
 
 #define LATCHPIN 5
 #define DATAPIN 4
@@ -46,6 +45,9 @@ byte ledsData[8];
 
 byte currentled = 0;
 
+
+// low level functions
+
 void clear() {
   for (int i=0; i < 8; i++) {
     // low is led on
@@ -76,25 +78,30 @@ void pushout() {
   digitalWrite(LATCHPIN, HIGH);
 }
 
-void setup() {
-  pinMode(LATCHPIN, OUTPUT);
-  pinMode(DATAPIN, OUTPUT);
-  pinMode(CLOCKPIN, OUTPUT);
+// space invader
 
-  clear();
-  pushout();
+//byte invaderA0[11] = {112,24,125,182,188,60,188,182,125,24,112};
+//byte invaderA1[11] = {14,24,189,118,60,60,60,118,189,24,14};
+
+static byte invaderA0[8] = {152,92,182,95,95,182,92,152};
+static byte invaderA1[8] = {88,188,22,63,63,22,188,88};
+
+bool invaderread(int x, int y, bool invaderstate) {
+  if (invaderstate) {
+    return bitRead(invaderA0[x],y);
+  } else {
+    return bitRead(invaderA1[x],y);
+  }
 }
 
-void drawinvader(int xposition, int yposition) {
-  // TODO yposition
-
-  for (int x=0; x<=11; x++) {
+void drawinvader(int xposition, int yposition, bool invaderstate) {
+  for (int x=0; x<8; x++) {
     int screenx = x+xposition;
     if (screenx >=0 && screenx < 8) {
       for (int y=0; y<8; y++) {
         int screeny = y+yposition;
         if (screeny >=0 && screeny < 8) {
-          if (bitRead(invaderA_1[x],y) == HIGH ) {
+          if ( invaderread(x,y,invaderstate) ) {
             writexy(screenx,screeny);
           }
         }
@@ -110,10 +117,201 @@ bool direction = true;
 int invaderstart = -12;
 int invaderend   = 8;
 int invaderposition = invaderstart;
+bool invaderstate = true;
+
+int statecount = 0;
+
+
+// Game of life
+
+byte gol_last[8];
+byte gol_next[8];
+byte gol_last2[8];
+byte gol_last3[8];
+byte gol_last4[8];
+
+long gol_stepcount;
+int gol_deadcount = 0;
+
+void gol_setup() {
+  gol_deadcount = 0;
+  for (int x=0; x<8; x++) {
+    gol_last[x] = 0;
+    for (int y=0; y<8; y++) {
+      if (random(4)<1) {
+        bitWrite(gol_last[x], y, HIGH);
+      }
+    }
+  }
+}
+
+void setup() {
+  pinMode(LATCHPIN, OUTPUT);
+  pinMode(DATAPIN, OUTPUT);
+  pinMode(CLOCKPIN, OUTPUT);
+
+  gol_setup();
+  clear();
+  pushout();
+}
+
+void gol_clearnext() {
+  for (int i=0; i<8; i++) {
+    gol_next[i] = 0;
+  }
+}
+
+bool gol_getstate(int x, int y) {
+  // warp around
+  if (x<0) {
+    x=7;
+  }
+  if (x>7) {
+    x=0;
+  }
+  if (y<0) {
+    y=7;
+  }
+  if (y>7) {
+    y=7;
+  }
+  return bitRead(gol_last[x],y);
+}
+
+byte gol_countNeighbours(int x, int y) {
+  byte count = 0;
+  for (int xoff=-1; xoff <= 1; xoff++) {
+    for (int yoff=-1; yoff <= 1; yoff++) {
+      if ( !(xoff==0 && yoff==0)  ) {
+        if (gol_getstate(x+xoff, y+yoff)  ) {
+          count++;
+        }
+      }
+    }
+  }
+  return count;
+}
+
+void gol_setnext(int x, int y) {
+  bitWrite( gol_next[x], y, HIGH);
+}
+
+void gol_writeLEDS() {
+  for(int x=0; x<8; x++) {
+    for (int y=0; y<8; y++) {
+      if (bitRead(gol_next[x],y)) {
+        writexy(x, y);
+      }
+    }
+  }
+
+}
+
+int gol_pixelcount;
+int gol_diffrences;
+int gol_diffrences2;
+int gol_diffrences3;
+int gol_diffrences4;
+
+void gol_step() {
+  gol_clearnext();
+  gol_pixelcount = 0;
+  for (int x=0; x<8; x++) {
+    for (int y=0; y<8; y++) {
+      bool myself = gol_getstate(x,y);
+      byte neighbours = gol_countNeighbours(x,y);
+      if ( neighbours==3) {
+        gol_setnext(x,y);
+        gol_pixelcount++;
+      }
+      if ( neighbours==2 && myself) {
+        gol_setnext(x,y);
+        gol_pixelcount++;
+      }
+    }
+  }
+
+  gol_writeLEDS();
+  pushout();
+
+  gol_diffrences = 0;
+  gol_diffrences2 = 0;
+  gol_diffrences3 = 0;
+  gol_diffrences4 = 0;
+  for (int i=0; i<8; i++) {
+    if (gol_last4[i] != gol_next[i]) {
+      gol_diffrences4++;
+    }
+    gol_last4[i] = gol_last3[i];
+
+    if (gol_last3[i] != gol_next[i]) {
+      gol_diffrences3++;
+    }
+    gol_last3[i] = gol_last2[i];
+
+    if (gol_last2[i] != gol_next[i]) {
+      gol_diffrences2++;
+    }
+    gol_last2[i] = gol_last[i];
+
+    if (gol_last[i] != gol_next[i]) {
+      gol_diffrences++;
+    }
+    gol_last[i] = gol_next[i];
+  }
+
+  if (gol_diffrences == 0 || gol_diffrences2==0 || gol_diffrences3 == 0 || gol_diffrences4 == 0 || gol_pixelcount == 0) {
+    //went static
+    gol_deadcount++;
+  }
+
+  gol_stepcount++;
+  delay(200);
+}
+
+// main loop
+
+int mode = 0;
+#define NRMODES 1
+
+void switchmode( ){
+  mode = random(NRMODES);
+
+  switch(mode) {
+    case 0: //game of life
+      gol_stepcount = 0;
+      gol_setup();
+    break;
+  }
+}
+
+
 
 void loop() {
   clear();
 
+  // check for end
+
+  switch(mode) {
+    case 0: // game of life
+      if (gol_stepcount >200) {
+        switchmode();
+      }
+      if (gol_deadcount > 12) {
+        switchmode();
+      }
+    break;
+  }
+
+  switch(mode) {
+    case 0: // game of life
+      gol_step();
+    break;
+
+
+  }
+
+
   /*
   // x-line
   for(byte i=0; i<8; i++) {
@@ -125,15 +323,26 @@ void loop() {
   }
   */
 
-  drawinvader(invaderposition,0);
+  /* invaders
 
-  invaderposition++;
-  if (invaderposition >=invaderend) {
-    invaderposition = invaderstart;
-  }
+  drawinvader(0,0, invaderstate);
 
   pushout();
 
+  invaderstate = !invaderstate;
+  statecount++;
+
+  if (statecount >=4) {
+    invaderposition++;
+    if (invaderposition >=invaderend) {
+      invaderposition = invaderstart;
+    }
+    statecount = 0;
+  }
+
+  invaders end */
+
+
 /*
   if(direction) {
     currentcol++;
@@ -149,5 +358,4 @@ void loop() {
     direction = true;
   }
   */
-  delay(300);
 }