Killer Aid vs Number Merge
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Killer Aid
This app assists players in solving challenging Killer Sudoku puzzles by providing tools to calculate and filter number combinations for cages. It helps identify duplicate numbers and offers a calculator optimized for specific solving strategies.
- Cage combination calculation
- Duplicate number highlighting
- Filter tools (Exclude, Include AND, Include OR)
- Optimized calculator for Killer Sudoku
- Help and strategy resources
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If you've struggled to complete tricky, tough, or deadly Killer Sudoku puzzles then this App could be for you. It provides a suite of tools to aid finding the minimum number of combinations that add up to each cage’s sum. The results are clearly displayed with any duplicate numbers highlighted in red. The target number of cells and their sum is entered using the edit tool. This presents a pick list of cells and sums values to simplify their selection and prevent invalid entries. It is also possible to select the display of combinations with duplicate values. Filter tools help reduce the possible combinations. Three variants of filter are provided namely: ・Exclude ・Include AND ・Include OR The exclude filter removes any combinations that contain the specified numbers. The "include AND" filter reduces the combinations down to those that include all the specified numbers. The "include OR" filter facilitates including combinations that contain one or more of a set of numbers. These three filter types can be combined together. Cage combinations can also be manually deleted. A calculator tool, optimised for solving Killer puzzles, is provided. This helps with some of the solving strategies (e.g. determining the sums of “innies” and “outies” - remainders inside and outside the a 3 x 3 square, row or column). The calculator includes formula text to keep track of entries. Lastly a support menu provides access to help, Killer Sudoku solving strategies and references sources of Killer Sudoku puzzles.
Number Merge
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Merge the numbers on the board to hit the target. Simple to learn, hard to put down. Number Merge is a calm, clever maths puzzle. Each level gives you a target and a handful of numbers. Pick a number, pick an operator, then tap another number to merge them. Keep going until one number is left. If it matches the target, you've solved it. HOW TO PLAY • Tap a number to pick it up • Choose +, −, × or ÷ • Tap another number to merge the two • Use every number and finish on the target FEATURES • 100 handcrafted levels across Easy, Medium, Hard and Intense • Boards of up to nine numbers, including negatives • Every level is guaranteed to have a solution • Stuck? Watch a short video for a hint that shows the next move • Quick tutorial to get you started • Relaxing music and satisfying haptic feedback • Plays offline • No timers, no lives, no pressure • Remove all ads with a one-off purchase, and hints become free
Screenshots
Verdict
The clearest difference is ads: Killer Aid at none against Number Merge's shown. Killer Aid also leads on update cadence (every 7 months vs every 15 months) and iOS requirement (12.4 vs 15.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Killer Aid ships an update every 7 months, Number Merge every 15 months. Both last shipped on October 24, 2026.
| Parameter | Killer Aid | Number Merge |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (43 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 43 — better | — |
| Update frequency | Every 7 months — better | Every 15 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.4 — better | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Trevor Butler | Blossom Labs Ltd |
In-app purchases
Killer Aid
No in-app purchases
Number Merge
No in-app purchases









