World 1 is the first world in Yoshi's Woolly World. It is a grassy plain with small forests. This world has nine levels: eight compulsory, and one optional special level unlocked after collecting all 40 Smiley Flowers for the world. Completing this world unlocks World 2.
Levels
| Level | Preview | Description |
|---|---|---|
| Yarn Yoshi Takes Shape! | 
|
A tutorial style level with many Shy Guys and Piranha Plants. |
| Bounceabout Woods | 
|
A level with bouncy platforms and trees. |
| Sponge Cave Spelunking | 
|
A cave level with many Nipper Plants. |
| Big Montgomery's Fort | 
|
A fortress level where Big Montgomery is fought. |
| Knitty-Knotty Windmill Hill | 
|
A level with small caves and many windmills. |
| Shy But Deadly | 
|
A level with varied Shy Guys and many logs. |
| Clawdaddy Beach | 
|
A beach level with many Clawdaddies and Watermelons. |
| Burt the Bashful's Castle | 
|
A castle level with lava, Keys and the first boss, Burt the Bashful. |
| Hang Tongue! | 
|
A night-time beach level with waterfalls and many Shy Guys. |
Enemies introduced
- Shy Guys
- Piranha Plants
- Nipper Plants
- Nipper Spores
- Monty Moles
- Lava Drops
- Gusties
- Bomb Guys
- Hook Guys
- Shy Guy Towers
- Clawdaddies
- Cheep Cheeps
- Burts
- Fly Guys
- Midboss: Big Montgomery
- Boss: Burt the Bashful