Before you know it, you'll be factoring every number you see.

Build numbers. Unleash primes. Discover new strategies.

『FACTORIZE 1』 is a turn-based deckbuilding roguelite where you combine cards to create numbers and battle with the powers of the prime factors hidden within them.

Leave the prime factorization to the game. You just decide which number to make.

Read the enemy's next move, figure out which prime effects you need, and build the right number from your hand.

Even with the same cards, there's never just one answer.

The number you make is your strategy.

Every number you create is instantly broken down into its prime factors, triggering the effects of each prime within it.

2 attacks. 3 defends. 5 heals.
7 strikes multiple times. 11 draws cards.

Take 66, for example:

66 → 2 × 3 × 11

Attack, defend, and add more cards to your next hand—all at once.

The goal isn't simply to make the biggest number.

It's figuring out how to pack the effects you need into a single number.

Watch the enemy's next move, study your hand, and create the number the moment calls for.

This isn't a game about finding the right answer.
It's about creating your own.

Change your deck, and the answer changes with it.

Along the way, you'll acquire new number cards and refine their combinations to build a deck of your own.

Your companion Fio can also transform into six different forms.

Each form changes the way numbers can be combined, opening up entirely different strategies with the very same cards.

Which form will you use?
Which cards will you take?
And what will you create from the hand you're dealt?

Every run brings a new answer.

Before you know it, numbers start to look different.

You see 12.

2 × 2 × 3.

You see 35.

5 × 7.

At first, you're only doing it to win battles.

But as you play, the primes hidden inside each number start revealing themselves naturally.

And even after you close the game, you may catch yourself factoring the numbers you see in everyday life.

What good is a talent like this?

While working on his summer homework, a boy realizes something for the first time.

Maybe I'm a genius at prime factorization.

But what good is a talent like that?

Then he is summoned to Factorium, a world where numbers hold power.

A talent that seemed useless in his own world is desperately needed here.

Why was he summoned?
Why is his power needed?

Choose a number.
Unleash its primes.
And choose what to do with the talent you've been given.