Factor Fort
Prime factors · 30 levels
Prime towers divide the monsters down to 1. Guard the gate!
How to play
- Monsters carry numbers down the road. A tower zaps a monster on each road square touching its pad, and divides the number by its prime when it divides evenly.
- Tap a tower (2, 3, 5 or 7), then tap a stone pad to build it. Tap a built tower to pick it back up.
- Build every tower and press Start. Every monster must be divided down to 1 before it reaches the castle.
Split each number into primes: 12 = 2 × 2 × 3 needs two zaps of 2 and one of 3. Pads on bends and between two roads zap more often (the ×2 badge shows how many).
Teeter, Tint and Echo Heist are free starters. Other games unlock through earned game choices or permanent packs. Your progress stays in the browser; optional sign-in saves it to your website account.