Bubble Sorting

The First Few Minutes

When you start, you'll see a screen with several tubes, some of them already filled with colored bubbles. A few tubes are empty, and that's your workspace. The game shows you a bubble at the top of each tube in order—you tap or click one to select it, then tap an empty space or another tube to move it there. The first level is simple enough to understand the basic flow: grab a bubble, place it somewhere new, repeat. But within a couple of moves, you'll hit your first real choice—place a bubble of one color next to another, and you've wasted a move. The game gives you five undos per level, which sounds generous until you realize how easily you can paint yourself into a corner. By the time you finish the second or third puzzle, you'll feel the difference between randomly moving bubbles and actually planning ahead.

Core Mechanic

This is a constraint-based puzzle where the core rule is simple but unforgiving: no two bubbles of different colors can sit directly next to each other in a tube. You move one bubble at a time from its current position to another tube, and it lands on top of whatever's already there. Every level starts with a scrambled mix of colors, usually three or four different shades spread across several tubes. Your job is to sort them so each tube contains only one color, from top to bottom. The elegance of the design is that you're not racing against time or gravity—you're fighting against the logical consequences of your own decisions. Place a red bubble on top of a blue one, and now you can't move that red bubble without first moving everything above it. This creates the actual puzzle: figuring out the sequence of moves that sorts everything without running out of your five undo tokens. Early levels feel like introductions, but the difficulty ramps by adding more colors, deeper tubes, and tighter initial states where almost every move matters.

Controls

Desktop: Click a bubble to select it, then click the tube or space where you want to drop it. Mobile: Tap a bubble to select it, then tap where you want it to go. The interface is entirely point-and-click or tap-based—there's no dragging, no complex gestures. Your selection stays active until you place the bubble or deselect it. This simplicity means the barrier to entry is almost zero, but it also means every mistake is entirely on you—the game isn't fighting you, your planning is.

Mistakes Everyone Makes

The first trap is treating this like a match-three game where speed matters. You'll grab bubbles and move them quickly, then realize you've locked yourself into an unsolvable state three moves later. The undo button becomes your lifeline, but each level only gives you five, so you can't undo your way through careless play. The second mistake is not looking ahead. Before you move a bubble, pause and ask yourself: if I place this here, what does my next move need to be? A lot of players just move whatever bubble is closest to its matching color, without noticing they're creating a traffic jam that blocks their endgame. The third is wasting undos early. Beginners often undo a move, redo it, then undo it again because they're second-guessing themselves. By the time they hit a genuinely stuck position, they've burned through most of their five chances.

When It Gets Hard

The early levels give you extra breathing room—usually more empty tubes than you strictly need, and color combinations that have multiple valid solutions. Around level five or six, the difficulty settings kick in, and the puzzle gets tighter. More colors squeeze into fewer tubes, empty spaces become scarce, and the scrambled starting position is one where almost any careless first move locks you out. The game introduces more depth too: longer tubes that demand you think several moves ahead, and situations where the only winning path requires moving a single color back and forth between tubes while you clear space elsewhere. This is where bubble sorting transforms from a casual puzzle into something that actually demands focus.

How to Actually Improve

First, look at the end state before you make any move. Mentally sort the bubbles: which colors need to go where? Then work backward from that goal. Second, identify your bottleneck—the tube or color stack that's blocking progress. Move that one first, even if it seems inefficient. Third, preserve your undo tokens. Use one strategically only when you've backed yourself into a corner you didn't see coming, not for every experimental move. Most importantly, slow down. The game doesn't penalize thinking time. Sit with a puzzle for thirty seconds before you move anything. Count your moves: if you think you need more moves than you have undos available, stop and reconsider. The difficulty settings let you adjust the challenge, so if you're stuck, it's worth trying an easier mode to build your intuition before grinding on the hard levels.

What to Expect After an Hour

After an hour, you'll have moved through perhaps fifteen to twenty levels, depending on difficulty and how many times you restart. The early stages will feel trivial in hindsight. You'll develop a reading skill—glancing at a board and immediately seeing which moves matter and which are dead ends. Some levels will click instantly; others will sit unsolved for ten minutes until one small shift in perspective makes the solution obvious. You'll stop relying on the undo button because you're planning further ahead. The game's real value becomes clear around this point: it's a lean, focused puzzle experience with no padding. There's no story, no character progression, no reward beyond solving the next level. What keeps you playing is the satisfaction of logic working. Each puzzle is self-contained, so you can play one level and stop, or chain them together. The difficulty adjustments mean the game scales with you—it won't get boring if you keep playing, but it also won't crush you if you just want something relaxing.

Controls

FAQ

Is this game really free and can I play it in my browser?

Yes. Bubble Sorting is completely free and runs directly in your web browser on both desktop and mobile. No download, no account required.

What happens when I run out of undo moves?

Each level gives you five undos. Once they're spent, you can't reverse moves anymore. If you reach an unwinnable state, your only option is to restart the level. This is why planning ahead matters more than moving fast.

Can I change the difficulty?

Yes. The game lets you adjust difficulty settings to find the mode that suits you. If a level is too hard, you can dial back the challenge; if it's too easy, you can make it harder.

How do I know which bubble to move first?

Look at the end goal: each tube should contain only one color. Identify which colors are mixed together and which moves will separate them. Usually, it helps to move the color that's blocking other colors first, even if that move seems counterintuitive.

Is there a time limit?

No. There's no timer or pressure to rush. You can take as long as you need to think through each move.

Can I play this on my phone?

Yes. The game works on mobile devices and uses a 720x1280 screen layout, so it's designed for portrait mode on phones. Just tap to select and place bubbles.

What's the goal of each level?

Sort all the bubbles so that each tube contains only one color. No two different colors can be next to each other in the same tube. Once you achieve this, you've solved the level and can move to the next one.