Clock Tower , definitely. I first played it at the age of 9 and it was a real thrill. Took me months to finish it and still haven't found about half of the endings even now. A real masterpiece I think
The sequels on PSX were mediocre though
It was Yoshi's Island on SNES.
In fact the first mario game I played was Super Mario World but I wasn't able to finish it because in world 4 I wasn't able to find the next level to go after the ghost house. There was probably a secret exit I wasn't able to find or something.
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