Kitty Sort Strategy Guide: How to Sort Every Shelf Without Getting Stuck
Levels 151 through 300 in ChillBrain are Kitty Sort — our reskin of the "bird sort" puzzle genre, with kittens napping on shelves instead of birds on branches. It looks simple: tap a shelf, tap another shelf, watch the kittens hop over. Getting genuinely good at it took me — and my mother, who plays daily — longer than either of us expected. Here's what actually works.
The rule in one sentence
Each shelf holds kittens in a row. Tap a shelf and its outermost same-colored group lifts up; tap a second shelf and that group hops over, but only if the destination shelf is empty or its own outermost kitten is the exact same color. Fill a shelf completely with one color and those kittens curl up and nap in the den — that shelf is done. Sort every color to win.
Rule 1: never move a group unless it goes somewhere useful
The classic beginner mistake is shuffling a matching pair from one nearly-empty shelf onto another nearly-empty shelf just because the move is legal. A legal move and a useful move aren't the same thing. Before tapping the destination, ask: does this either (a) complete a shelf, or (b) expose a color underneath that I actually need right now? If the answer to both is no, that move is very likely a wasted turn that will need undoing later.
Rule 2: hunt for the color hiding one kitten deep
The real skill in this game is reading what's under the visible top group, not just what's on top. A shelf showing two orange kittens with a single blue one hiding right beneath them is a much better target than it looks — clear those two oranges elsewhere and you've freed the blue. Scan every shelf for "one move away" colors like this before committing to your first move each turn; it's the single habit that separates a fast clear from a long, frustrating one.
Rule 3: rest spots are for parking with a plan, not parking to feel busy
Every board gives you one or two free rest spots that each hold a single kitten. They're genuinely useful for temporarily setting a kitten aside while you work the shelf underneath it — but only if you already know where that kitten is going next. Parking a kitten in a rest spot "just in case," with no shelf in mind for it, tends to just cost you a slot you'll need later, since a rest spot only holds one napper until you place it back down somewhere.
Rule 4: if you're truly stuck, it's more likely a helper moment than a lost cause
Every board we ship is verified solvable before it goes live — I run a solver against every single Kitty Sort level, so if you ever feel boxed in, there genuinely is a way out. When that happens:
- ↩️ Undo — back out of your last few moves and try a different order. This alone resolves most "stuck" feelings.
- 🪜 Extra shelf — adds one temporary shelf to give yourself breathing room. Use it once you've genuinely run out of legal moves, not before.
- 🔀 Shuffle — redistributes the kittens across every unfinished shelf. The best choice when the board itself, not just your last few moves, has painted you into a corner.
All three cost 1💚 from the same lifeline pool every mode shares; sorting a level with no helpers at all earns the full 3⭐.
Later levels: bigger shelves, hidden colors, less room
The difficulty climbs in three separate ways as you move through the 150 Kitty Sort levels: shelves grow from holding 4 kittens up to 6, the color count climbs toward ten, and from level 191 onward the game switches to "mystery" mode, where only the outermost kitten on each shelf is visible — you're sorting partly from memory of what you've already seen. None of this ever adds a timer; the difficulty is entirely about how much you have to plan and remember, never about speed.