This is a classic Adventure Game with multiple levels, various monsters, and different objects to collect.

Your character can be moved using the arrow keys and can swing their sword by using the spacebar. Each of the monsters will cause damage if you run into them - they can be destroyed with the sword - they may need to be hit more than one time.

You move to the next level by collecting all of the keys. Some of the keys are 'hidden' and you can only get to them one way.

The final challenge is to get to the Treasure Chest after collecting each of the keys on the third level.

Good luck!