# Sum Stack: Number Sort Puzzle — Water Sort Style Brain Game

> Water Sort Style Brain Game (iPhone/iPad app by Carlos Bruguera.)

- Source: https://appshunter.io/ios/app/sum-stack-number-sort-puzzle/id6809880543 (this page in markdown: same URL + `.md`)
- Developer: [Carlos Bruguera](https://appshunter.io/developer/1438652874)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 185 MB
- Languages: American English, European Spanish
- Released: 2026-10-28
- Data updated: 2026-11-11

## What is Sum Stack?

Sort. Sum. Stack. Solve.

Sum Stack is the addictive number-sorting puzzle that adds a twist to the sorting genre you already love. Instead of matching colors, you're matching numbers — and every container has a target sum you need to hit exactly.

HOW TO PLAY

Each stack holds a mix of numbered tiles. Your goal: move tiles between stacks until every container's numbers add up to its target sum, shown right on the label. Sounds simple — until you meet the one rule that changes everything.

THE HANOI RULE

You can never place a bigger number on top of a smaller one. Every move has to respect the order — just like the classic Tower of Hanoi puzzle. This single constraint turns "just sort the numbers" into a real brain-teaser: you'll need to think two, three, even five moves ahead before you commit.

WHY YOU'LL GET HOOKED

Easy to learn, genuinely hard to master — the first few levels take a minute, the later ones take real thought.
No timers, no penalties for thinking. Play at your own pace, whether that's a quick break or a long focus session.
Hundreds of handcrafted levels, from gentle warm-ups to serious number-logic challenges.
A calm, clean design built for satisfying, screen-relaxing sessions — this is a puzzle game you play to unwind, not to stress out.
Perfect for fans of number puzzles, sorting games, and classic logic challenges like Tower of Hanoi — all combined into one addictive loop.

A DIFFERENT KIND OF SORTING PUZZLE

If you love water-sort and color-sort games, Sum Stack gives you that same "just one more level" pull — but adds a layer of real math and planning that color-matching alone never had. Every stack is a small puzzle in itself: which tile goes where, and in what order, so nothing gets stuck under a number it can never move again?

FEATURES

Simple one-tap controls — move a tile, watch the sum update instantly.
Progressive difficulty that ramps naturally as you unlock new mechanics.
Clean, minimal visuals so the only thing you focus on is the puzzle.
New levels added regularly — there's always a next stack to solve.

Whether you're waiting for a bus, taking a coffee break, or just want to give your brain something satisfying to chew on, Sum Stack is the number puzzle that respects your intelligence — and rewards your patience.

Download now and start stacking smart.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 5000 coins | $7.99 | one-time |
| 10.000 Coins | $14.99 | one-time |
| 25.000 coins | $34.99 | one-time |
| 50.000 coins | $59.99 | one-time |
| 100.000 coins | $89.99 | one-time |
| Gear Bundle | $7.99 | one-time |
| Circuit Bundle | $19.99 | one-time |
| Gold Core Bundle | $29.99 | one-time |
| Ignition Bundle | $3.99 | one-time |
| Jumpstart Bundle | $2.99 | one-time |


## Is Sum Stack safe?

Not enough ratings yet to assess Sum Stack.

## Is Sum Stack legit?

Sum Stack: Number Sort Puzzle appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Sum Stack is 63 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.0 - 4 — 2026-10-28

Thanks for playing! This update brings:

• Bug fixes and stability improvements
• Fixes and tweaks to several levels
• General polish for a smoother experience

If you're enjoying the game, a rating or review helps us a lot. See you in the next update!

### 1.0 — 2026-10-28

No release notes.

## More apps by Carlos Bruguera

- [Triple Match King: Tile Sort](https://appshunter.io/ios/app/triple-match-king-tile-sort/id6471499967)
- [Sky Wheel: Weather & Forecast](https://appshunter.io/ios/app/sky-wheel-weather-and-forecast/id6761054265)

All apps by Carlos Bruguera: https://appshunter.io/developer/1438652874

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-11.*