# Plus15 Daily Logic Puzzle Game — Daily Brain Training Challenge

> Daily Brain Training Challenge (iPhone/iPad app by Engine Lane.)

- Source: https://appshunter.io/ios/app/plus15-daily-logic-puzzle-game/id6758319819 (this page in markdown: same URL + `.md`)
- Developer: [Engine Lane](https://appshunter.io/developer/663680054)
- Category: Games, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 43 MB
- Languages: American English, Japanese
- Released: 2026-02-10
- Data updated: 2026-07-23
- User reviews in markdown: https://appshunter.io/ios/app/plus15-daily-logic-puzzle-game/id6758319819/reviews.md

## What is Plus15 Daily Logic Puzzle Game?

+15 is a daily spatial logic puzzle built around a simple constraint: the grid must be divided into exactly 15 regions, and every region must add up to 15.

Regions can vary in size.  Some may contain just two tiles, while others require three or more. All number tiles must be used, and each puzzle has one unique solution. There is no guessing ... only deduction.

How it works:
• Partition the grid into exactly 15 regions
• Each region must sum to 15
• Regions vary in size
• Every tile is used
• Each puzzle has one valid solution

Features:
• A new daily puzzle
• Easy, Medium, and Hard difficulties
• Clean, distraction-free design
• Optional hints when you’re stuck

Sometimes being right leads you wrong. Find the unique solution.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 5 Hints | $2.99 | one-time |



## Version history (last 5 releases)

### 1.4.0 — 2026-07-17

The +15 One Shot Daily Challenge is a new tension-filled game mode where every lock matters. You need complete confidence that the region you’re locking is part of the one unique solution.

### 1.3.3 — 2026-04-22

Numerous new puzzles have been added to each level, and the UI has been updated overall!

### 1.3.2 — 2026-04-12

Improved localization support and metadata updates.

### 1.31 — 2026-03-05

More Puzzles Added!  And game mechanics tracking added

### 1.3 — 2026-02-23

Upgrade in app purchase system and added Streak tracking

## More apps by Engine Lane

- [7 Minute Workout (High Intensity Interval Training)](https://appshunter.io/ios/app/7-minute-workout-high-intensity-interval-training/id663680051)
- [7 Minute Power Plank Workout](https://appshunter.io/ios/app/7-minute-power-plank-workout/id723299338)

All apps by Engine Lane: https://appshunter.io/developer/663680054

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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 2026-07-23.*