Free on iPhone & iPad · Number puzzle game
Flip bridges.
Match every sum.
Number Puzzles: Sumbriska is a quiet, clever math logic puzzle. Each bridge carries two numbers; flip them until every island hits its goal, and build your own harbor as you go. Think you're quick? Beat the 60-second challenge.
- No ads or accounts
- Works offline
- Family friendly
On a computer?Point your iPhone camera here to get Sumbriska.
Tap the bridge. Fern wants 4. The clock starts on your first tap.
376
handmade boards
6
regions to build
1
new board daily
0
ads, ever
4+
age rating
The Lighthouse Challenge · free
Can you make Harbor Master?
Twenty boards, right here in your browser. Each one you solve builds the lighthouse and moves you up a rank. Get every star to become a Lighthouse Legend.
Deckhand
1 board
First bridge flipped. You're aboard.
Rope Hand
3 boards
You're thinking in pairs now.
Lamplighter
8 boards
The lighthouse is taking shape.
Navigator
14 boards
Two Tides don't scare you.
Harbor Master
20 boards
Lantern Harbor is lit.
Inside the app
Rules in a minute. Depth for months.
Two Tides
One arrangement of bridges has to satisfy two sets of goals as the tide rises and falls. Two puzzles that must agree.
Build your island
Every solved board adds a part to a landmark. Lighthouses, windmills and harbors grow across six themed regions.
Three kinds of puzzle
Bridges, plus Shipyard cargo balancing and Observatory beacon rings. Same calm logic, fresh twists.
Help without penalty
Hints, Undo and step-by-step explanations are always there and never cost XP. Learn at your own speed.
Daily number puzzle
A new board every day. Same one for everyone.
Solve today's board in your browser or in the app, keep your streak alive and send friends your stars, without spoilers.
Play today's puzzleIf you like Kakuro, KenKen or Hashi
Sumbriska borrows the best parts of classic number puzzles and adds one simple move: the flip.
Kakuro
Like Kakuro, every answer is a sum. But there are no blank cells to fill: you only decide which way each bridge faces.
KenKen
Like KenKen, arithmetic meets pure logic. No guessing needed, and every board has exactly one solution.
Hashi (Bridges)
Like Hashiwokakero, you connect islands with bridges. Here each bridge carries two numbers you can swap.
Made for families
Screen time you won't worry about.
Addition practice that feels like play, in a world with no ads, no chat and no strangers.
A guide for parents- Child profiles never see purchases or outside links
- Grown-up area behind a PIN or Face ID
- No ads, accounts, chat or tracking
- Works fully offline: planes, cars, waiting rooms
Honest pricing
Free to download and genuinely playable. Upgrade only if you want more.
Free
$0
- Lantern Harbor and Orchard Isles: 40 boards
- The daily board
- The Deep and Harbor Run
- Gentle and Steady practice
- Every hint and Undo, always
Voyage Pass
$4.99/month
or $29.99/year · optional · no free trial
- Regions 3 to 6: 80 more campaign boards
- All Shipyard and Observatory boards
- Gale Run and a fourth daily Tide Order
- Clever and Deep practice, 3- and 4-ring workshop
- Premium boat paints, sails and decorations
US prices. Prices vary by region. Auto-renews until cancelled in your App Store account settings.
Questions
What kind of game is Sumbriska?
A calm number logic puzzle. Islands show goals, bridges carry two numbers, and you flip bridges until every island's total matches. It uses simple addition, so it works for kids and grown-ups alike.
Where can I download Sumbriska?
Sumbriska is a free download on the App Store for iPhone and iPad. Search for "Sumbriska" or tap any Download on the App Store button on this site.
Is it free?
Yes. The free download includes regions 1 and 2 (40 campaign boards), the daily board, The Deep, Harbor Run, Gentle and Steady practice, plus every hint and Undo. An optional Voyage Pass subscription ($4.99 a month or $29.99 a year in the US, no free trial) unlocks regions 3 to 6 and more.
Does it have ads or need an account?
No ads, no accounts, no chat and no tracking. The app works fully offline and does not collect data.
Is it suitable for kids?
Yes. Child profiles never see purchases or outside links, and grown-up settings are protected by a PIN or Face ID.
Can I play without downloading anything?
Yes. The 20 boards of Lantern Harbor and the daily board are playable free on this website, in any modern browser.
Which devices does it run on?
iPhone and iPad with iOS or iPadOS 18 or later.
Your first bridge is one tap away.
Free on iPhone and iPad. 376 boards, a new one every day, no ads, no account and no internet needed.
On a computer?Point your iPhone camera here to get Sumbriska.