Cut the Rope Level 421 — Underground Box Walkthrough (3 Stars)
Level 421★★★★★
Guide by LevelWalks
By Level 421 of Cut the Rope, you've already cleared 420 puzzles, which is exactly the moment the design starts to use that confidence against you. This one is built for players who've stopped reading the question carefully.
## Cut the Rope — Underground Box, Level 21
**Box:** Underground Box | **Level:** 421 (Underground Box #21)
## Walkthrough
This level uses electric sparks, teleportation, candy transformers, anti-gravity and magic hats. The candy starts from the right side and Om Nom is waiting at the bottom.
### Step-by-Step Solution
1. **First, observe the layout.** Look at where the candy hangs and trace a path to Om Nom. Note every rope, bubble, and obstacle.
2. **Cut the first rope** — the one holding the candy closest to the top. This drops the candy toward the first star.
3. **Use the electric sparks** to redirect the candy toward the second star. Timing is important here — wait until the candy swings to its peak before activating.
4. **Collect the final star** by using the teleportation to swing the candy wide.
5. **Guide the candy to Om Nom.** If you miss a star, the candy should still reach Om Nom — just replay for a perfect score.
### Getting All 3 Stars
- Star 1: Drops naturally when you cut the first rope.
- Star 2: Requires precise timing with the electric sparks.
- Star 3: The hardest one — you need to time the magic hats perfectly before the candy falls past it.
## Tips for This Level
The Underground Box introduces electric sparks which add a new dimension to your puzzle-solving. Don't rush — watch the candy's momentum and plan two moves ahead.
## Why This Level Is Tricky
These levels are designed to be completed, even when they feel impossible. The developers playtested every star path, so there's always a solution. If you've been stuck for a while, try a completely different order of operations — sometimes the first cut isn't the obvious one.
## Common Mistakes
Players frequently make these errors on Level 421:
- Popping bubbles too early or too late — bubbles need precise timing to redirect the candy toward stars.
- Forgetting that air cushions have a fixed direction and strength, so the candy's entry angle matters.
- Cutting multiple ropes in rapid succession when the level requires waiting for the candy to reach a specific position first.
Tips
- Cut ropes in order from top to bottom for the most control over candy movement.
- In the Underground Box, electric sparks are key — learn their timing patterns.
- You don't need all 3 stars to progress, but replay levels later for a perfect score.
FAQ
- How do I beat Cut the Rope Level 421?
- Level 421 (Underground Box #21) uses electric sparks, teleportation, candy transformers, anti-gravity and magic hats. Cut the ropes in sequence, collect all 3 stars by timing your cuts, and guide the candy to Om Nom. See the step-by-step walkthrough above.
- How do I get 3 stars on Cut the Rope Level 421?
- To get all 3 stars, you need to collect each star before the candy reaches Om Nom. Star 3 is usually the hardest — it requires precise timing with electric sparks.
