Sprocket City turns kindergarten math practice into a build: your child reads a question, taps the answer, and a right answer snaps a part onto a helper bot. When the Big Build powers on, a district of Sprocket City lights up. Every task comes straight from the California Common Core math standards for kindergarten. Free in any browser, with no account, no sign-up, and no ads.
Every question is tagged to the California Common Core math standard it comes from, so you can see exactly what is being practiced.
Skill
Standard
Count to answer "how many?" up to 20
K.CC.B.5
Compare groups: greater than, less than, equal (up to 10)
K.CC.C.6
Count forward from a given number
K.CC.A.2
Name shapes regardless of orientation or size
K.G.A.2
Represent addition and subtraction with objects and drawings
K.OA.A.1
Decompose numbers up to 10 into pairs
K.OA.A.3
Directly compare two objects by a measurable attribute
K.MD.A.2
Teen numbers as ten ones and some more ones
K.NBT.A.1
Find the number that makes 10
K.OA.A.4
Fluently add and subtract within 5
K.OA.A.5
Compare two written numerals from 1 to 10
K.CC.C.7
Count to 100 by ones and by tens
K.CC.A.1
Add and subtract word problems within 10
K.OA.A.2
Jobs in Kindergarten
Lantern Yard at the Salvage Yard: Counting and cardinality. Big Build: Lantern Drones.
Gear Garden at the The Forge: Putting together and taking apart. Big Build: Hauler.
Ten-Frame Tower at the Crystal Caverns: Teen numbers and fives. Big Build: Crane Walker.
Count Dock at the Sky Dock: Counting on. Big Build: Rescue Balloon.
Sample Kindergarten problems
40, 50, 60, ?
Answer: 70
2 batteries are in the box and 6 are on the bench. How many altogether?
Answer: 8
How the practice works
Pick kindergarten and a job. Your child chooses a helper bot look, then starts the first task. No login screen stands between them and the game.
Every question is one part. A right answer snaps it into place. Miss, and the game names the likely slip in plain words, then shows the step worked out before the next question. Nothing is lost.
The difficulty tunes itself. A per-standard rating keeps your child succeeding roughly three times out of four, so comfortable skills stay comfortable while new ones stretch a little.
Missed skills come back on a spaced schedule mixed in with newer work, and every task is tagged to a standard so the progress report reads the way a teacher's does.
For parents and teachers
Sprocket City is untimed by default. A clock appears only if you switch on Challenge mode, and it never blocks progress, because timed drill is associated with math anxiety rather than fluency. Every question can be read aloud in English or Spanish, there is a calm mode with fewer effects, and an errorless mode for the youngest learners. The progress report shows mastery by standard, time on task, and which skills are due for another pass, and it prints in English or Spanish.
Questions
Is it really free?
Yes. Every grade, job, and feature is included with no account and no personal information required. There are no ads and no in-app purchases anywhere in the game. Districts can license a hosted version with rostering; the classroom experience is the same.
Does it work on a Chromebook?
Yes. It runs in Chrome with no installation, or installs as an app from the browser menu. It works offline after the first load.
Is it in Spanish?
Yes. One tap switches every screen, question, and coaching message to Spanish, and questions can be read aloud in either language.
What about students with IEPs?
Calm mode, errorless mode, larger targets, keyboard and switch play, text scaling, spaced text, and read-aloud are all built in. The teacher dashboard exports per-standard progress monitoring data as a CSV.
Which standards are covered?
The table on this page lists every standard practiced in this grade. Every question in the game shows its standard code.