This page details bugs of Castlevania: The Adventure.
Zombie Glitch#
If the player dies on the same frame they exit a room (commonly via ropes), Christopher will not actually die, and will hang on a rope even if he does not have any HP remaining. When in this state, if Christopher is hit by a enemy, he'll not receive any knockback, nor he will lose a life. The time limit also won't kill him, as the timer will jump to 99:59 after reaching 00:00.
However, it is still possible to lose a life when the glitch is in effect; if the player goes up, down, or jumps off the rope, the player will actually lose a life. Interestingly, pausing the game will also make the player lose a life when the glitch is in effect, though it'll result in the level reloading while the game is paused, forcing the player to unpause once the level reloads.