Building World is a world exclusive to the PC version of Mario's Early Years! Fun with Letters. It is one of the seven islands in the game and is represented by a pair of building blocks.
The world takes place in a area of pipes and a background of puzzle pieces.
It revolves around a baseball game setting, where players must sound out three-letter words depending on what is clicked on. Various animations occur when the cast is clicked on.
| Mario's Early Years! Fun with Letters / Mario's Early Years! Fun with Numbers / Mario's Early Years! Preschool Fun | |
|---|---|
| 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 • Building World (SNES · PC) • Sound World • Last Letter World • Sing Song Worlda • Story Worlda |
| Worlds (Fun with Numbers) |
Number World • Counting World • Comparing World • How Many World • Shape World • Same and Different World • Sorting World • Sing Song World |
| Worlds (Preschool Fun) |
Shape World • Counting World • Body World • Listening World • Opposite World • Color World • Sing Song World • Time World |
| Other | Warp Pipe • Gallery (Preschool Fun) |