Cut the Rope Level 21 — Cardboard Box Walkthrough (3 Stars)

## Cut the Rope — Cardboard Box, Level 21 **Box:** Cardboard Box | **Level:** 21 (Cardboard Box #21) ## Walkthrough This level uses bubbles, rocket boosters and time reversals. The candy starts from the top 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 bubbles** 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 popping the bubble at the right moment. 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 bubbles. - Star 3: The hardest one — you need to use the bubble to float up before the candy falls past it. ## Tips for This Level The Cardboard Box introduces bubbles 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 The physics engine introduces momentum, gravity, and pendulum motion as core mechanics. Early levels seem simple, but the trajectory calculations that feel intuitive now become critical as complexity increases. Pay attention to how the candy swings after each cut. ## Common Mistakes Players frequently make these errors on Level 21: - 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.