Here are some cheats and tips for the game The Castlevania Adventure.
Bonus rooms:
Level 1
Locate the third set of rolling eyes. Climb the rope into
the ceiling.
Level 2
Locate the bridge. Continue moving downward until reaching
a location where rolling eyes are falling to the right with stairs
leading in the same direction. Destroy one of the eyes so it explodes
on the second step from the bottom. Fall down the small hole that
is created by the explosion. Climb down the invisible rope into
the bonus room.
Bonus life:
Leave the first ten candles in level one. Whip the eleventh
candle to collect an extra life.