Stack Sorting

Stack Sorting is a classic color-sorting puzzle. The board is filled with randomly stacked colorful cylinders — your job is to organize each stack so every cylinder ends up with its matching color. You can only move the top cylinder of a stack — either to an empty slot or onto a stack of the same color.

Simple tap controls, deep logic. Plays instantly in your browser — no downloads or sign-ups needed.

About Stack Sorting

Two modes available: Easy (more stacks, more time) and Hard (fewer stacks, time limit). In Hard mode every move counts — wasted moves make solutions harder. Levels get trickier as colors multiply, but the core logic stays the same. Made a mistake? Just undo it.

Why kids love it

Classic logic training — pattern recognition, sequential thinking, planning. Pure enough that adults enjoy a quick session too. Fast feedback: finish a level and the next one opens right away.

Is it safe?

Yes. No violence or scary content — just colorful cylinders. Suitable for ages 6 and up.

1. Open the page and choose a mode (Easy or Hard).
2. Tap a cylinder — the top one lifts up.
3. Tap the target stack — it must be empty or the same color.
4. Sort all stacks by color.
5. Complete the board to finish the level.
6. A new level opens with increased difficulty.

• Don't rush to use the empty stack — unnecessary moves waste time.
• Group colors: gather one color into a shared stack before moving on.
• Use a stack as a temporary holding spot when untangling mixed stacks.
• Hit undo when you slip up — no need to restart from scratch.
• In Hard mode, count your moves; fewer moves means more stars.

• Two difficulty modes (Easy, Hard)
• Dozens of levels with increasing challenge
• Undo mechanic
• Simple tap controls
• Works on mobile and desktop