How to Play Marble Sort

The Rules, Plain and Simple

Marble Sort looks like a relaxing ASMR game, and the controls are simple — but the belt turns it into a sequencing puzzle. Here's the whole ruleset:

• Marbles sit in a top tray, waiting to be dropped.
• Tap a marble and it falls onto a moving circular conveyor belt.
• The belt carries the marble to a bottom box of the matching color.
• Each box holds three marbles. Fill all three and the box clears.
• Clear every box and you win the level.
• If the belt fills up with marbles that have no matching box, you lose.

Controls

Marble Sort uses one-tap controls. You don't aim, drag, or swap — you only decide which marble to drop and when. Tap a marble in the top tray and the belt handles the routing. That's the entire control scheme, which is exactly why the game lives or dies on your drop order.

The Belt Is the Real Opponent

Most sorting puzzles let your mistakes sit still. In Marble Sort, every dropped marble keeps moving on the belt until it finds a home. A marble with no matching box doesn't disappear — it loops, occupies a slot, and makes the next drop riskier. The belt has a hard capacity, and when it's full, the run ends.

That's the core skill of the game: never drop a marble unless its box is ready to take it.

Step-by-Step: A Clean Run

1. Scan the boxes. Find the color closest to a three-match — a box with one or two marbles already in it.
2. Tap that marble. Drop the piece that finishes or advances the nearest-to-complete color.
3. Let the belt route it. Watch the marble travel until it packs into its box.
4. Finish the color. Once a box clears, that lane is free for the next color.
5. Repeat, keeping a lane open. Always leave at least one box you can dump strays into.

Beginner Mistakes to Avoid

• Dropping the most visible marble first. Visibility isn't priority — proximity to a three-match is.
• Opening four colors at once. Spreading progress across every box guarantees a flooded belt.
• Ignoring buried colors. A color trapped under others gets more expensive to reach the longer you wait.
• Saving boosters for "later." On hard levels, using a booster early to avoid a flood is cheaper than restarting.

What to Do Next

Once you've got the basics, the two systems that end runs are boosters and obstacles. Learn when to spend a Magnet and how to survive an Elevator floor, and hard levels stop being hard.