Ages 8–12 · Grades 3–7 · 15 levels
Primefall Bastion
Hold the Primefall Bastion against a storm of falling numbers. Pop the right balloons with your cannon and sort numbers by their nature: odd and even, multiples, factors, prime numbers, square and cube numbers, divisibility, prime factors, and common factors and multiples. 15 levels for ages 8–12.
- Prime numbers
- Factors
- Multiples
Levels
A free account unlocks levels 3–4
Create a free account
A subscription unlocks levels 5–15
Try every level free for 30 days
How to play
- In cannon levels, tap a balloon to fire at it. Pop the balloons that fit the rule or answer the question, and let the others land.
- Popping a wrong balloon cracks one of your 3 shields. A right one that lands just counts as missed.
- In the other levels, sort, fill in or order the numbers, then check.
- Score 60% or higher to unlock the next level.
- Levels 1–2 are free with no account. A free account also unlocks levels 3–4.
- A small monthly subscription unlocks every remaining level.
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Questions and answers
What maths does Primefall Bastion teach?
Number properties: odd and even, multiples, factors and factor pairs, prime numbers, square and cube numbers, divisibility by 3 and 9, prime factors, and highest common factor and lowest common multiple.
What age is it for?
Ages 8 to 12. Level 1 starts with odd and even numbers; the last levels reach highest common factor and lowest common multiple, usually met at 11 or 12.
Is there a calmer mode for the falling balloons?
Yes. The Calm setting, or your device's reduced-motion setting, slows the balloons right down and turns off the bonus balloon.