Sumaddle review

Sumaddle turns Doppelblock, a puzzle the listing traces to the Japan Puzzle Championship 2006, into an interactive app. Each puzzle has one solution, and the app shows the possible number combinations for every clue, so you reason about which fit instead of doing sums in your head. The US App Store listing says more than 150 puzzles are included for free, the built-in help that explains each logical step is free to use as much as you like, and play is ad-free with absolutely no ads. It also works offline and has strong VoiceOver support. If you want more, puzzle packs cost $0.99 each and a Puzzle Generator costs $9.99. The drawbacks are platform and range: it is for iPhone and iPad on iOS 17 or later only, and every puzzle is the same type. We compared documented features and published prices.

Who it is for

Number puzzle fans who want hints that explain the logic

Price

More than 150 puzzles free with no ads; puzzle packs from $0.99 and the Puzzle Generator at $9.99 on the US App Store.

Tricky, Pack 1 $0.99
Quoted from the vendor pricing page on November 11, 2026.

Key features

• More than 150 puzzles included free
• Built-in help that explains the logic at each step and can fix mistakes, free to use
• Puzzles solved with pure logic, no mental arithmetic required
• Works offline
• VoiceOver support and other accessibility features

Strengths and weaknesses

• Strength: Listing says ad-free play, with absolutely no ads
• Strength: Built-in help is free and unlimited
• Strength: Packs are cheap at $0.99 each
• Weakness: iPhone and iPad only, and it requires iOS 17 or later
• Weakness: Puzzle Generator costs $9.99
• Weakness: Only one puzzle type, Doppelblock

Key facts

• Free puzzles: More than 150
• Puzzle type: Doppelblock, also called Smashed Sums
• Puzzle pack: $0.99 on the US App Store
• Languages: English and German

Where it ranks

Sumaddle is No. 6 in our Best Free Puzzle Games Without Ads verdict.