Sum Stack

Sort. Sum. Stack. Solve.

Sum Stack is the number sort puzzle that adds a fresh twist to the sorting genre. If you love water sort games, you'll love this number-based sorting puzzle — same addictive stacking gameplay, but now every move actually matters.

HOW TO PLAY THIS NUMBER SORT PUZZLE

Each stack holds a mix of numbered blocks. Your goal in every level of this sort puzzle: move numbers between stacks until each container's total matches the target sum shown on its label. It's a simple sort mechanic — until you meet the one rule that changes the entire puzzle.

THE HANOI SORTING RULE

You can never stack a bigger number on top of a smaller one. Just like the classic Tower of Hanoi puzzle, every move must respect this order. This single rule turns simple number sorting into real brain training — you'll need to plan several moves ahead before committing to any stack.

A DIFFERENT KIND OF SORT PUZZLE GAME

Water sort puzzle fans already know the pull of organizing color-coded stacks until everything's in order. Sum Stack takes that same sort puzzle formula and adds math and logic on top — every stack is a small block puzzle where sequence and sum both matter. It's part number puzzle, part sorting game, part logic puzzle.

WHY PLAYERS GET HOOKED ON THIS BRAIN PUZZLE

Easy to learn, genuinely hard to master — early levels of this puzzle game take a minute, later ones take real math and logic.

No timers, no penalties. Play this relaxing puzzle game at your own pace.

Hundreds of handcrafted number sort levels, from gentle warm-ups to serious brain challenges.

Clean, calm design built for a satisfying puzzle session — this brain game is meant to help you unwind, not stress you out.

Perfect for fans of number games, sort puzzle games, math puzzle games, and logic puzzles like Tower of Hanoi.

BLOCK SORT MEETS NUMBER LOGIC

Every stack in this block sort puzzle is its own mini math challenge: which number goes where, and in what order, so nothing gets trapped under a number it can never move again? If you enjoy math games, brain games, or classic block sort puzzles, this number sort puzzle was built for you.

FEATURES

Simple one-tap controls — move a number, watch the sum update instantly.

Progressive difficulty that ramps naturally as new mechanics unlock.

Minimal, clean visuals so all your focus goes to the puzzle.

New sort puzzle levels added regularly.

Whether you're commuting, on a break, or just want a relaxing brain puzzle to unwind with, Sum Stack respects your intelligence and rewards patience. Sort, sum, stack, solve — download this addictive number puzzle and start stacking smart today.