When reaching a dead end situation in the game, you may want to choose the option "Restart round" from the Pause menu. This command equals suicide - you lose one life and restart the level as the Kid as though you died from natural causes (i.e. slaughtered by fiends).
Restart Round a.k.a Suicide

Among the variety of circumstances that can push a player to restart a round, you might lose a helmet you needed to exit the level, or lose an elevator, or accidentally destroy a block needed to advance.

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