What Colorfill Actually Is
Colorfill is a web-based math game from Hooda Math where you solve arithmetic problems to claim territories on a grid. The premise is simple enough that I almost didn't bother writing this up, but there are some quirks that aren't obvious until you've been burned by them a couple of times. I'll get to those. The game loads in a browser. You pick a difficulty—addition, subtraction, multiplication, division, or a mix—and then a board appears with empty cells that need to be filled with colors corresponding to your answers. You solve the problem, pick the color, and the cell fills. First player to control the most territory wins. That's the loop.
Getting Started with Colorfill Hooda Math
You don't need to download anything. Hooda Math runs it straight from the site, which is one less thing to worry about. Just go to hoodamath.com and search for Colorfill. It works on Chrome, Firefox, Edge—I haven't tested Safari but it should be fine. No account required, no ads mid-game that actually interrupt gameplay. The load time is usually under five seconds on a decent connection. The interface has you on one side of the board, your opponent (or the computer) on the other. Problems appear one at a time. You answer, the cell fills, and the board updates in real time. Multiplayer works over the same browser session—you share a screen, take turns answering, and try to out-fill each other. Single player pits you against AI that gets progressively harder the further you go.
How I Use It and Where It Falls Apart
I run Colorfill with my kid most evenings when we're working on multiplication facts. It works well for that because the pressure of the timer forces quick recall instead of counting on fingers. But here's the thing nobody tells you: the game only tests speed, not strategy. Once you know the answers, there's no actual decision-making involved. You just answer faster than the other side. I realized this around game twenty and stopped being impressed by high scores. There's also a weird edge case with the division problems. When the answer is a remainder, the game sometimes rounds instead of truncating, and I've watched kids get confused because their manual calculation didn't match what the game accepted. I found the workaround is to stick to multiplication and addition modes for practice purposes and avoid the division difficulty if they're still learning how remainders work. The division sets are fine for pure speed drilling once they already understand the concept. Another limitation: the game doesn't track progress across sessions. Close the tab and you're back at square one. There's no unlock system, no streak counter, no way to see that you've improved over the week. For a tool that's supposed to build fluency, that's a real gap. I ended up keeping a simple spreadsheet just to track their average response times over a two-week period, which took maybe ten minutes to set up and turned out to be more useful than the game itself.
Get the Full Details
The Setup I Actually Recommend
Turn on the timer. Let the default speed stand—some people slow it down and then complain it's not challenging, but the default pace is what actually builds fluency. Practice in five-minute bursts, not twenty-minute marathons. After about fifteen minutes the answers start blurring together and they're just mashing keys. Stop while it's still fun. If they're working on specific facts that are weak—say, the seven times table—pick the multiplication mode and accept that the game won't target those specifically. It's random within the chosen difficulty. You can ask them to say the problem out loud before answering to reinforce the connection, which takes about ten seconds per problem but adds meaningful reinforcement without derailing the flow. For the most part Colorfill Hooda Math does what it claims to do. It's not a comprehensive math curriculum. It's a drill tool. Used correctly, it shaves roughly twenty percent off fact recall time over a few weeks based on what I've seen. Used blindly, it's just a colorful way to do the same worksheets they're already doing. The difference is whether you're paying attention to what's actually happening during the game.
