- Bump to attack/break walls with the pickax.
- Level exit is the yellow tile.
- Your health is the bar at the top right.
- Your chosen weapon is in top left. Toggle with "z" if you have other weapons.
- Find new weapons scattered in later levels.
- The pickax deals one damage. Other weapons deal two (but don't break walls).
- Find hearts to replenish health.
- Enemies may take a few hits before they go down.