Crystal Castles (Atari 2600)

Bentley Bear is trapped in CRYSTAL CASTLES, home of Berthilda the Witch and her evil cronies. To escape, he must harvest all the gems in each castle while avoiding the deadly touch of the castles' inhabitants. Watch for the magic hat. As long as he's wearing it, Bentley is invincible. But look out! If Bentley isn't careful, the evil creatures will turn him into bear stew!