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If you encounter issues on modern hardware, these community-sourced fixes from PCGamingWiki can help:
Stun ghosts before eating them to add an extra 300 points to the base 100-point value.
Collect a multiplier token before scaring ghosts. The attack combo multiplier goes up to 5x—using it while ghosts are scared can yield up to 6,400 points.
Eat different colored berries to unlock special attacks and elemental powers needed to progress.