[Edit] Mario's Early Years! Fun with Letters / Mario's Early Years! Fun with Numbers / Mario's Early Years! Preschool Fun
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| Characters | Mario • Luigi • Princess Peach • Toad • Yoshi • Baby Yoshi | |
| Enemies | Piranha Plant • Goomba • Bowser • Larry Koopa • Iggy Koopa | |
| Worlds | Fun with Letters | First Letter World • Vowel World • Alphabet World • Sentence World • Blending Worlda • Building Worldb • Sound World • Last Letter World • Sing Song Worldb • Story Worldb |
| Fun with Numbers | Number World • Counting World • Comparing World • How Many World • Shape World • Same and Different World • Sorting World • Sing Song Worldb Pattern Worldb | |
| Preschool Fun | Shape World • Counting World • Body World • Listening World • Opposite World • Color World • Sing Song Worldb • Time Worldb | |
| Other | Gallery (Gallery:Mario's Early Years! Fun with Letters · Mario's Early Years! Fun with Numbers · Mario's Early Years! Preschool Fun) • Warp Pipe | |
a Referred to in the SNES version as Building World b Exclusive to the PC version | ||