When your enemy has 0 or less Hit Points left, you have to attack one more time to deliver the finishing blow.
Swords give a bonus to your attack
Shields absorbs damage
Armor improves armor class
Amulets raise heal power
Rings increase chance of hitting
Notes
The original creator of this game is Matt Nelson. This game was
originally posted on postandplay.com, and Matt's website flyingsoup.com, both now defunct.