🚀 Starlight Station FREE
Skill focus: Add/Sub within 10
The space station's lights went dark and the star snacks vanished! Count along to fix the station and find out who did it.
🎖️ Play free now → About this case📐 Common Core math practice · Kindergarten
Kindergarten math is where numbers stop being decoration and start being tools. A cadet at this level is learning to count reliably to 100, to write numerals, to see that a teen number is really "a ten and some more," and to add and subtract small quantities without losing track. Number Cadets wraps that practice inside a mystery: to open the space station's snack locker or crack the vault's first lock, your child has to count the objects correctly, compare two numbers, or take some away and say what's left. The maths is never dressed down — it is the mechanism the story runs on. Get it right and the story moves; get it wrong and the case waits patiently while they try again.
🎖️ Start the free Kindergarten mystery See plans
Skill focus: Add/Sub within 10
The space station's lights went dark and the star snacks vanished! Count along to fix the station and find out who did it.
🎖️ Play free now → About this caseSkill focus: Count, add within 10 & count by tens
The villain locked our stolen case files behind a four-layer vault. Beat four fiendish defences — laser grid, bullion balance, gear works and trip-wire alarm — to recover the files and unmask the thief.
Launch activity → About this caseSkill focus: Numbers to 20: count, order & stack
The Grand Library's most treasured book vanished when someone secretly retyped its catalog card. Crack the card catalog, reshelve the scrambled stacks, beat the due-date desk and check the receipts to unmask the book-napper.
Launch activity → About this caseSkill focus: Count on, make ten, tally graphs & shapes
The Golden Teddy — the carnival's famous grand prize — vanished the night before the big raffle! Crack the ticket booth's number roll, measure the evidence at the sweet stand, rebuild the prize graph and pop only the right balloons to unmask the prize-napper.
Launch activity → About this caseSkill focus: Count & share equal piles, +/− within 10
A chest of gold was sworn to be split into fair, equal shares — but one greedy pirate grabbed more than their share and re-buried the treasure! Split the plunder into equal shares, weigh the doubloons, crack the captain's log and fire the cannons to unmask the pirate who broke the code of fair shares.
Launch activity → About this caseSkill focus: Teen numbers, count arrays, count on & compare heights
The prize-winning Golden Sunflower vanished the night before the Bloomtown Flower Show! Bundle the spilled seeds, replant the trampled beds, hop the bee-line trellis and rebuild the sprout charts to unmask the Blooming Bandit.
Launch activity → About this caseAcross the six Kindergarten cases your cadet counts to 100 by ones and tens, counts forward from any starting number, writes numerals to 20, and answers "how many?" for objects arranged in lines, arrays and scattered piles. They compose and decompose the teen numbers into a ten plus some ones, break numbers under 10 into pairs, and build fluency adding and subtracting within 5. They also compare written numerals, compare objects by height and length, sort things into categories and count each category, and describe and compare two- and three-dimensional shapes.
Every question is tagged to one of these 12 standards, and mastery is tracked per standard for each agent. Official Common Core wording:
| K.CC.A.1 | Count to 100 by ones and by tens. |
|---|---|
| K.CC.A.2 | Count forward beginning from a given number within the known sequence (instead of having to begin at 1). |
| K.CC.A.3 | Write numbers from 0 to 20. Represent a number of objects with a written numeral 0-20 (with 0 representing a count of no objects). |
| K.CC.B.5 | Count to answer "how many?" questions about as many as 20 things arranged in a line, a rectangular array, or a circle, or as many as 10 things in a scattered configuration; given a number from 1—20, count out that many objects. |
| K.CC.C.7 | Compare two numbers between 1 and 10 presented as written numerals. |
| K.G.B.4 | Analyze and compare two- and three-dimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts (e.g., number of sides and vertices/"corners") and other attributes (e.g., having sides of equal length). |
| K.MD.A.2 | Directly compare two objects with a measurable attribute in common, to see which object has "more of"/"less of" the attribute, and describe the difference. |
| K.MD.B.3 | Classify objects into given categories; count the numbers of objects in each category and sort the categories by count. |
| K.NBT.A.1 | Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones. |
| K.OA.A.2 | Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. |
| K.OA.A.3 | Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1). |
| K.OA.A.5 | Fluently add and subtract within 5. |
No — every Kindergarten case is built to Kindergarten standards, with numbers kept inside the ranges the Common Core specifies (counting to 100, adding and subtracting within 10, fluency within 5). Questions are read aloud and answered by tapping, dragging and counting rather than by typing, so a child who can't yet read fluently can still play independently.
Not really. The story is narrated, the instructions are spoken, and answers are given by tapping or dragging objects. Early readers manage on their own; pre-readers usually enjoy it more with an adult nearby for the story beats.
A Kindergarten case is four clue rounds of five questions — usually 10 to 15 minutes, which is about the length of a five-year-old's productive attention span. It can be paused and resumed; progress is saved.
Yes. Every question is tagged to a specific Kindergarten standard, and the standards each case covers are listed in full on this page with their official wording. Mastery is tracked per standard, so you can see exactly which ones your child has secured.