Comparison

Killer Aid vs Number Merge

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Cage combination calculation
  • Duplicate number highlighting
  • Filter tools (Exclude, Include AND, Include OR)
  • Optimized calculator for Killer Sudoku
  • Help and strategy resources
Features
Read full description

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.

About

Number Merge

Features
Read full description

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

Killer Aid4 screens
Number Merge4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Killer Aid ships an update every 7 months, Number Merge every 15 months. Both last shipped on October 24, 2026.

Scorecard3 real differences · 7 level
Killer Aid versus Number Merge: the parameters behind the verdict, then further details
ParameterKiller AidNumber Merge
PriceFreeFree
Rating4.9 (43 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings43 — better—
Update frequencyEvery 7 months — betterEvery 15 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.4 — better15.0
Further details — not scored
Size1 MB27 MB
Age rating4+4+
DeveloperTrevor ButlerBlossom Labs Ltd

In-app purchases

None

Killer Aid

No in-app purchases

None

Number Merge

No in-app purchases

Questions

Is Killer Aid free?
Killer Aid is free to download, with no in-app purchases.
Is Number Merge free?
Number Merge is free to download, with no in-app purchases.
Do Killer Aid or Number Merge have ads?
Number Merge shows ads; Killer Aid does not.
Which is updated more often, Killer Aid or Number Merge?
Killer Aid ships an update every 7 months, and Number Merge every 15 months. Most recently, Killer Aid was updated on October 24, 2026 and Number Merge on October 24, 2026.

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