If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
There are 14 amazing levels in this Ninja game. Try to reach the end of each level and try collecting items. But there is a timer so you have to hurry. You can open doors by getting the keys for it. At the end of each level you will get a secret code, so you can start at the level you reached.
Use arrow keys to move.