Colony Flow Level 521 Answer Key, Walkthrough & Solution
Level 521 Video Walkthrough
Watch how to clear level 521 without boosters. Want to practice first? Play Colony Flow free in your browser ↗
📋 Written practice guide (web version)board preview, color breakdown & loading order for the playable web level
Board Preview
What You're Up Against
Level 521 paints Donut with 208 tiles across 4 colors, split into 7 cubes in the tray. You have 5 waiting slots and two nest holes.
- Yellow: 88 tiles → cubes of 55, 33
- Black: 86 tiles → cubes of 49, 30, 7
- Red: 24 tiles → cubes of 24
- Violet: 10 tiles → cubes of 10
⚠️ 1 hidden “?” cube in the tray.
Spoiler: what they hide
Red 24
Step-by-Step Solution
This loading order was computed from the web level layout with a reachability-first strategy: always feed the ants colors they can actually reach, and never let all 5 slots fill with blocked colors. Tap hidden “?” cubes only when you have slot room to absorb a surprise color.
Load the cubes in this order, letting the ants work between picks. Unless noted, a cube's tiles are fully reachable when you send it.
- Send the Yellow 33 cube.
- Send the Yellow 55 cube. Only ~42 of its 55 tiles are open at this point — park it in a slot and let the surrounding colors clear the rest of the way.
- Send the Black 30 cube.
- Send the Black 7 cube.
- Send the Black 49 cube. Only ~21 of its 49 tiles are open at this point — park it in a slot and let the surrounding colors clear the rest of the way.
- Send the Violet 10 cube.
- Send the Red 24 cube. Only ~12 of its 24 tiles are open at this point — park it in a slot and let the surrounding colors clear the rest of the way.
Finish without boosters for 3 stars and bonus coins. If the board jams anyway, a Shuffle or Vacuum booster is the cheapest way out.