Addition Blitz is a free online addition game that runs in the browser with no download and no account. A board of number tiles sits in front of you and a target number sits above it: tap two, three or four tiles that add up to exactly that target and they clear, fresh tiles drop into the gaps, and a new target appears. Clear the level's quota of targets before the clock empties. What makes it different from an addition worksheet is the direction the arithmetic runs. A worksheet gives you 7 + 8 and asks for the answer; here you are given 15 and have to find it in what is on the board, which is the skill that makes mental addition quick — recognising which numbers go together rather than grinding out one sum at a time. Every target is built from tiles that are genuinely on the board, so there is always a way to make it, and no single tile ever shows the target number, so a solve always takes real addition. Twelve levels grow from pairs of single digits up to four-tile sums on a wider board with numbers into the forties.
How to play Addition Blitz
- Press Start. A target number appears above the board — "Make 15" — and the clock starts running down.
- Tap tiles to add them together. The line under the target shows your running sum and how much is still to go.
- When your tiles add up to the target exactly, they clear, new numbers drop into their places and the next target appears.
- Go over the target and the whole selection is dropped so you can start again. Nothing is lost except the seconds, but overshoots cost you stars.
- Tap a lit tile again to take it back out of the sum, or use Clear to drop the whole selection.
- Every solve puts a little time back on the clock — though never more than the round started with, so the timer stays a timer.
- Clear the level's quota of targets before the clock empties to unlock the next level. A solve always needs at least two tiles.
- Restart replays the same board; New Board deals a different one at the same level.
Tips
- Start from the largest tile that still fits under the target. It leaves the smallest remainder to find, and the remainder is usually sitting right there.
- Learn the pairs that make ten — 3+7, 4+6, 8+2. On the bigger levels most targets break down into one of those pairs plus a leftover.
- For a target like 23, look for a tile ending in 3 and pair it with a round number, or the other way round. Splitting the target into tens and units is faster than scanning every tile.
- When a target is odd, at least one of your tiles has to be odd. That single observation cuts a board of sixteen tiles roughly in half.
- Three-tile targets are often easier than they look: pick any two tiles, read the gap, then hunt for the gap. You are searching for one number instead of a combination.
- Do not be afraid to overshoot deliberately on a hard target — dropping the selection costs no time, and seeing the sum go past the target tells you which tile to swap.
- The clock tops out at the round's starting time, so banking early solves buys you nothing. Spend the easy targets fast and keep the cushion for the awkward ones.
FAQ
Is Addition Blitz free to play?
Yes. It runs in your browser with no download, no sign-up and nothing to buy. All twelve levels are included and unlock in order as you clear them.
What age is this addition game for?
The early levels are pairs of single-digit numbers, which suits roughly ages six and up, and the later ones ask for four-tile sums with numbers into the forties, which is a real workout for an adult. Because levels unlock in order you can stop wherever the maths stops being comfortable.
Can a target ever be impossible to make?
No. Every target is generated as the sum of tiles that are actually on the board at that moment, and it is re-derived after each refill, so a way to make it always exists. If you cannot see it, it is there.
Why does tapping the single tile that matches the target do nothing?
That situation never comes up — the generator refuses any target that a single tile already shows. A solve needs at least two tiles, because a game about addition where one tap can win is not practising addition.
What happens if I go over the target?
The selection is dropped and you start the sum again. You lose no time and no progress, but the round counts your overshoots and they cost you stars at the end.
How is this different from Mental Math Challenge?
Mental Math Challenge shows you a sum and asks you to type the answer, across all four operations. Addition Blitz runs the other way: it gives you the answer and you find the sum among the tiles. One drills recall, the other drills number sense.
Does the clock ever run out of control?
Each solve returns a second or two, but the clock can never rise above the time the round started with. Without that cap a quick player ends up gaining more time than they spend, and the level stops being timed for the people who need the pressure least.
Does Addition Blitz work on a phone?
Yes. The board sizes itself to whichever screen dimension is tighter, tiles stay thumb-sized in portrait, and everything is a single tap — no dragging and no typing.