The key to clearing stages is to control PAC-MAN's mood, which affects what PAC-MAN will and will not do.
Collecting 3 cartridges hidden within the world will unlock a playable "Ms. PAC-MAN" stage.

In Japan

Kenzaburo Oe receives the Nobel Prize in Literature. Sony Computer Entertainment launches the PlayStation console. Kansai International Airport opens to the public. The Prime Minister's Official Residence's official webpage goes live.
「Susume! Denpa Shounen」, 「Tamori No Super Vocabular Tengoku」, 「Homeless Child」
「Forrest Gump」, 「Speed」, 「Schindler's List」
Mr. CHILDREN「Innocent World」, Kohmi Hirose 「Romance No Kamisama」, Ryoko Shinohara 「Itoshisato Setsunasato Kokoro Zuyosato」