colonyflow Level 21

Overview

Level 21 is a Normal four-color stage whose target picture is a pixel-art soccer ball on a green field: a large cream-colored panel layer (about 39% of tiles), dark gray ball panels (about 27%), a green field background (about 25%), and a red accent (about 9%), with tiny orange, blue, black, pink and cyan trace accents. The goal is to clear every tile by tapping the number tiles at the bottom so ants carry each color away. Because the tiles are stacked, the cream panel layer must leave first, then the dark gray panels, with the green field and red accent finishing as the bottom layers.

• Difficulty: Regular (Normal)
• Estimated moves: 20–35 taps

Step-by-Step Solution

1. Start by tapping the yellow tile. Yellow is the cream panel layer of the soccer ball and sits on the top layer, so it is reachable immediately. Tap it and let the ants march to the ball and begin carrying the yellow squares away.
2. While the yellow carry is running, clear the tiny orange, blue, black, pink and cyan trace tiles opportunistically. They become reachable as the panels come off; tapping them whenever a slot opens keeps the ants busy without blocking a slot.
3. Continue tapping yellow until most of the panel layer is carried off. Do not switch to gray until the yellow is nearly gone; any leftover yellow keeps covering the gray panels and blocks the ants' path inward.
4. When yellow is mostly gone, tap the gray tile. Gray forms the dark pentagon panels of the soccer ball and was covered by the cream layer, so it only becomes reachable now. Keep the queue pointed at gray in one continuous push and use the 2x speed-up button in the top-right corner to shorten the wait.
5. Next, tap the green tile. Green is the field background behind the ball and is exposed only after the gray panels finish. Sweep green in a moderate push, keeping spare slots free.
6. Finish with the red tile. Red is the small accent on the ball — the bottom layer — so it is the last color to be exposed. Because it is final, the queue can safely be filled with red to speed up the finish.
7. Keep the five-slot queue under active control: push one main color plus at most one small color at a time, finish a color before starting the next, and never jam all five slots with mixed colors.

Strategy & Reasoning

The level is built around the layered-stacking rule: a color that covers others must be carried away first, and the removal order measured in the solution video is yellow, gray, green, red, which matches the geometry of the soccer ball. Clearing the cream panel layer before gray matters because it sits on top; tapping gray first would leave those panels buried. The queue is the bottleneck — four main colors plus trace accents share only five slots, and the worst mistake is pushing yellow and green at the same time, which leaves no room for the small traces and forces waiting. The efficient play is to alternate the large yellow carry with the small gray and trace colors so the ants are almost never idle. The 2x speed-up button should be active for the long yellow panel carry, since that single step accounts for most of the level's waiting time. If the queue jams, the Magnet tool pulls one whole color out of the line, while the Eraser is reserved for a single stuck tile.

Tips & Common Mistakes

• Tapping the gray panels before the yellow cream layer is gone is the classic mistake. The gray tiles are still covered, so the ants have no path to them; always clear yellow first.
• Running yellow and green at the same time jams the five-slot queue and strands the small traces. Finish yellow and gray completely before starting green.
• Ignoring the tiny orange, blue, black, pink and cyan traces leaves slots blocked for no reason. Clear them opportunistically whenever a slot is free, instead of saving them all to the end.

Key Frames