diff --git a/main_test.c b/main_test.c
new file mode 100644
index 0000000..70260c7
--- /dev/null
+++ b/main_test.c
@@ -0,0 +1,105 @@
+/**
+  @file main_test.c
+
+  This is a front end that serves as an automatic test of the game.
+
+  This fronted tries to play the game and see if it behaves how expected. If you
+  change anything substantial in the game, this test may start to fail and you 
+  may need to adjust it.
+
+  by Miloslav Ciz (drummyfish), 2019
+
+  Released under CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/)
+  plus a waiver of all other intellectual property. The goal of this work is
+  be and remain completely in the public domain forever, available for any use
+  whatsoever.
+*/
+
+#include <stdio.h>
+#include "game.h"
+#include "sounds.h"
+
+uint32_t time = 0;
+
+int8_t SFG_keyPressed(uint8_t key)
+{
+  return 0;
+}
+
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+}
+
+uint32_t SFG_getTimeMs()
+{
+  return time;
+}
+
+void SFG_sleepMs(uint16_t timeMs)
+{
+}
+
+static inline void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
+{
+}
+
+void SFG_playSound(uint8_t soundIndex, uint8_t volume)
+{
+}
+
+void SFG_setMusic(uint8_t value)
+{
+}
+
+void SFG_processEvent(uint8_t event, uint8_t data)
+{
+}
+
+void SFG_save(uint8_t data[SFG_SAVE_SIZE])
+{
+}
+
+uint8_t SFG_load(uint8_t data[SFG_SAVE_SIZE])
+{
+}
+
+void printTestHeading(const char *text)
+{
+  printf("\n~~~~~ testing: %s ~~~~~\n\n",text);
+}
+
+int main(void)
+{
+  puts("===== TESTING ANARCH =====\n");
+
+  puts("initializing");
+
+  #define ASSERT(text,cond) { printf("checking \"%s\": ",text); if (cond)  puts("OK"); else { puts("ERROR"); return 1; }}
+
+  SFG_init();
+
+  ASSERT("frame == 0",SFG_game.frame == 0);
+
+  printTestHeading("music and sounds");
+
+  {
+    static const expectedSamples[] = { 1, 0, 0, 0, 0, 0, 255, 251, 80, 240, 240, 10, 0, 6, 4, 0 };
+
+    uint16_t pos = 0;
+
+    for (uint32_t i = 0; i < (SFG_TRACK_COUNT * SFG_TRACK_SAMPLES); ++i)
+    {
+      uint8_t sample = SFG_getNextMusicSample();
+
+      if (i % 200000 == 0)
+      {
+        ASSERT("music sample", sample == expectedSamples[pos]);
+        pos++;
+      }
+    }
+  }
+
+  puts("DONE\neverything seems OK");
+
+  return 0;
+}