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Thinky
Sum Square
Drop the numbers into the colored boxes such that the sum of the numbers equals the required number for each box.
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About Sum Square
Drop the numbers into the colored boxes such that the sum of the numbers equals the required number for each box. The levels start off easy but later levels can be very tough. See if you can use your addition and thinking skills to complete all 60 levels.......without using the solutions button on the main menu too much!
It leans fully into thinky, so if that's your thing, it delivers. Whether you want a quick five-minute break or a longer session, it runs smoothly on just about any device.
A couple of things help once you get going: Spend the first round learning the controls before you chase a high score. Use the pause function liberally; most games let you regroup without penalty.
You can play Sum Square free online at Glaze Games — it loads in seconds, works on phone and desktop, and never asks you to sign up.
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How to play Sum Square
Sum Square is a free online game you can play in your browser. No download, no account, no waiting — press Play and you're in.
- 1Press the green Play button above to launch Sum Square in the embedded player.
- 2Give it a few seconds to load; most games are small and are ready almost immediately on a typical connection.
- 3Watch for a quick tutorial on the opening screen — most browser games walk you through the basics as you start.
- 4Click or tap anywhere on the game canvas to give it focus before you start using the keyboard.
Frequently asked questions
Is Sum Square free to play?
Yes — Sum Square is free, with no hidden cost. You don't need to pay, register, or install anything; the full game loads right in your browser.
Do I need to download anything to play Sum Square?
Not at all. Sum Square is a browser game, so there's no download and no setup. Click Play and it loads on the spot.
Can I play Sum Square on my phone?
Yes. Sum Square works on mobile, tablet, and desktop browsers. Use whichever screen size you prefer — the game adapts to fit.
Is Sum Square safe to play at school?
Sum Square loads from a reputable publisher and runs through Glaze Games' filtered catalog, so it's a safer alternative to random "unblocked games" sites. Whether it works depends on your school's network — if standard game domains are open, Sum Square will load.
Where can I find more games like Sum Square?
Once you've finished Sum Square, scroll down to the "More games like this" section — we surface similar titles from the same category. You can also browse the full catalog by genre from the home page.
Player reviews for Sum Square
Community verdict
10 reviewsPlayer reviews
Honestly didn't expect to get this hooked on Sum Square — one more round turned into an hour.speedrun_dom
Fun pick-up-and-play — Sum Square has about the right difficulty.
Been coming back to Sum Square all week. Simple but genuinely fun.
Sum Square is nice and smooth; a leaderboard would make it even better.
Whole friend group is on Sum Square now. Best thinky find this week.
Honestly didn't expect to get this hooked on Sum Square — one more round turned into an hour.
Sum Square is the perfect time-killer. I keep saying one more go and never stop.
Controls in Sum Square feel tight and it just plays great. 10/10.
Sum Square is alright — gets grindy, but I still open it now and then.
Didn't think a browser thinky game could be this good — Sum Square proved me wrong.
Sum Square hits different — the kind of game you bookmark and keep coming back to.
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