Sumaddle
Free
2.6.1for iPhone
Age Rating
Sumaddle Screenshots
About Sumaddle
• “Brilliant puzzle game”, UK App Store review Apr 2025
• “Best Puzzle Game I’ve Ever Played”, US App Store review Jan 2025
• “The ONLY iOS game I've never gotten tired of”, Reddit review Apr 2024
This type of logical puzzle was first seen in the Japan Puzzle Championship 2006 and is sometimes known as Doppelblock, or Smashed Sums. When played with pencil and paper, these puzzles can be hard work to solve. Sumaddle changes that by adding the essential element of interaction. This transforms the puzzles into intriguing brain teasers that unfold before your eyes.
Each puzzle has a unique solution. Finding the solution involves fitting the number combinations to the clues. The app makes it easy to view the possible combinations, you don’t need to do any sums in your head. Instead, you can focus on using logic to narrow down the combinations and find a fitting arrangement.
Some reasons why you will enjoy playing Sumaddle:
• puzzles range in size and difficulty from small and simple to large and mind-blowing
• more than 150 puzzles are included for free
• all puzzles can be solved with pure logic, no mental arithmetic required
• the sophisticated built-in help can explain the logical reasoning at each step and also fix mistakes if you go wrong
• the built-in help is completely free, use it as much as you like
• works offline (great for long journeys)
• a high standard of accessibility, including comprehensive support for VoiceOver
• ad-free play - there are absolutely no ads!
IGRS age rating (Indonesia Game Rating System): 3+
• “Best Puzzle Game I’ve Ever Played”, US App Store review Jan 2025
• “The ONLY iOS game I've never gotten tired of”, Reddit review Apr 2024
This type of logical puzzle was first seen in the Japan Puzzle Championship 2006 and is sometimes known as Doppelblock, or Smashed Sums. When played with pencil and paper, these puzzles can be hard work to solve. Sumaddle changes that by adding the essential element of interaction. This transforms the puzzles into intriguing brain teasers that unfold before your eyes.
Each puzzle has a unique solution. Finding the solution involves fitting the number combinations to the clues. The app makes it easy to view the possible combinations, you don’t need to do any sums in your head. Instead, you can focus on using logic to narrow down the combinations and find a fitting arrangement.
Some reasons why you will enjoy playing Sumaddle:
• puzzles range in size and difficulty from small and simple to large and mind-blowing
• more than 150 puzzles are included for free
• all puzzles can be solved with pure logic, no mental arithmetic required
• the sophisticated built-in help can explain the logical reasoning at each step and also fix mistakes if you go wrong
• the built-in help is completely free, use it as much as you like
• works offline (great for long journeys)
• a high standard of accessibility, including comprehensive support for VoiceOver
• ad-free play - there are absolutely no ads!
IGRS age rating (Indonesia Game Rating System): 3+
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What's New in the Latest Version 2.6.1
Last updated on May 11, 2026
Old Versions
This version features some usability improvements and styling adaptions. The changes in detail:
• Each clue of a puzzle is now shown as having the shape of a button. This makes it more apparent that the clue values are also buttons. The shapes also help to indicate that a button is available, even when a clue value is hidden (in this case, the button can be used to fill gaps in the associated row or column).
• The new button shapes for clue values can be turned off in the settings, if preferred. The setting can be found in the section “Layout & Appearance” under the heading “Puzzle clues”.
• When the setting to “allow combinations to be deleted individually” is turned on, the clue value that is currently selected is shown highlighted with an underscore. This makes it possible to see, which clue the combinations relate to. This is of particular significance when there are multiple clues with the same value.
• A usability issue concerning the panel with number combinations has been addressed. This panel sometimes overlaps the button for pausing a button, especially if playing on a small screen. Previously, this meant it was quite easy to tap the pause button by accident when trying to delete individual number combinations. An invisible buffer zone around the panel now stops this from happening (the panel is simply hidden instead).
• The red filter is supported more comprehensively. It now works for all forms of popup interaction too.
• The settings popup features some styling adaptions for iOS 26.
Version 2.6.1 also includes some corrections to the way help actions are performed.
• Each clue of a puzzle is now shown as having the shape of a button. This makes it more apparent that the clue values are also buttons. The shapes also help to indicate that a button is available, even when a clue value is hidden (in this case, the button can be used to fill gaps in the associated row or column).
• The new button shapes for clue values can be turned off in the settings, if preferred. The setting can be found in the section “Layout & Appearance” under the heading “Puzzle clues”.
• When the setting to “allow combinations to be deleted individually” is turned on, the clue value that is currently selected is shown highlighted with an underscore. This makes it possible to see, which clue the combinations relate to. This is of particular significance when there are multiple clues with the same value.
• A usability issue concerning the panel with number combinations has been addressed. This panel sometimes overlaps the button for pausing a button, especially if playing on a small screen. Previously, this meant it was quite easy to tap the pause button by accident when trying to delete individual number combinations. An invisible buffer zone around the panel now stops this from happening (the panel is simply hidden instead).
• The red filter is supported more comprehensively. It now works for all forms of popup interaction too.
• The settings popup features some styling adaptions for iOS 26.
Version 2.6.1 also includes some corrections to the way help actions are performed.
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Version History
2.6.1
May 11, 2026
This version features some usability improvements and styling adaptions. The changes in detail:
• Each clue of a puzzle is now shown as having the shape of a button. This makes it more apparent that the clue values are also buttons. The shapes also help to indicate that a button is available, even when a clue value is hidden (in this case, the button can be used to fill gaps in the associated row or column).
• The new button shapes for clue values can be turned off in the settings, if preferred. The setting can be found in the section “Layout & Appearance” under the heading “Puzzle clues”.
• When the setting to “allow combinations to be deleted individually” is turned on, the clue value that is currently selected is shown highlighted with an underscore. This makes it possible to see, which clue the combinations relate to. This is of particular significance when there are multiple clues with the same value.
• A usability issue concerning the panel with number combinations has been addressed. This panel sometimes overlaps the button for pausing a button, especially if playing on a small screen. Previously, this meant it was quite easy to tap the pause button by accident when trying to delete individual number combinations. An invisible buffer zone around the panel now stops this from happening (the panel is simply hidden instead).
• The red filter is supported more comprehensively. It now works for all forms of popup interaction too.
• The settings popup features some styling adaptions for iOS 26.
Version 2.6.1 also includes some corrections to the way help actions are performed.
• Each clue of a puzzle is now shown as having the shape of a button. This makes it more apparent that the clue values are also buttons. The shapes also help to indicate that a button is available, even when a clue value is hidden (in this case, the button can be used to fill gaps in the associated row or column).
• The new button shapes for clue values can be turned off in the settings, if preferred. The setting can be found in the section “Layout & Appearance” under the heading “Puzzle clues”.
• When the setting to “allow combinations to be deleted individually” is turned on, the clue value that is currently selected is shown highlighted with an underscore. This makes it possible to see, which clue the combinations relate to. This is of particular significance when there are multiple clues with the same value.
• A usability issue concerning the panel with number combinations has been addressed. This panel sometimes overlaps the button for pausing a button, especially if playing on a small screen. Previously, this meant it was quite easy to tap the pause button by accident when trying to delete individual number combinations. An invisible buffer zone around the panel now stops this from happening (the panel is simply hidden instead).
• The red filter is supported more comprehensively. It now works for all forms of popup interaction too.
• The settings popup features some styling adaptions for iOS 26.
Version 2.6.1 also includes some corrections to the way help actions are performed.
Sumaddle FAQ
Click here to learn how to download Sumaddle in restricted country or region.
Check the following list to see the minimum requirements of Sumaddle.
iPhone
