diff --git a/simon_game/readme.md b/simon_game/readme.md
index 149009d..f336568 100644
--- a/simon_game/readme.md
+++ b/simon_game/readme.md
@@ -1,3 +1,17 @@
 ## Simon Game for BBC micro:bit V2
 
-The game is inspired by [Simon electronic games](https://en.wikipedia.org/wiki/Simon_(game)) and is written in MicroPython.
+The game is inspired by [Simon electronic games](https://en.wikipedia.org/wiki/Simon_(game)) and is written in MicroPython (not compatible to micro:bit V1), using the accelerometer to sense gestures to the four directions and has buzzer sound effects.
+
+```
+How to play:
+
+1) Upload the script as main.py or in the form of .hex file.
+2) After the welcome effects, press A + B to start.
+3) Memorize the Simon sequence in each turn.
+4) Tilt the board toward indicated directions to match the sequence.
+5) After each tilting gesture, you have to return it to horizontal position.
+6) Game will end when you failed.
+7) There is no limit how long the Simon sequence can go.
+```
+
+The code is shared under General Public License 3.0.