×FACTORS
ATTACKLUNAR DEFENCE DIVISION / 01

FACTOR MISSIONS. UNDER ATTACK.

Find the factors.

Defend your planet.

LEVEL 1 BEST0

Hit +100 · Collect +25
High scores saved on this browser

◆ 0 / 5 crystal power0 cycles completed1.0× speed
YOUR TARGETMultiples of 10
SCORE0
DESTROYED00 / 12
MISSILES15

MISSION BRIEFING

Earth needs
your maths.

Shoot the factors. Let the decoys pass.
Keep at least one missile silo standing.

Choose a level. Sound starts when you launch.

SECTOR 07 · LUNAR OUTPOST
Standing by for launchLEVEL 1 · ROUND 1 / 3

Clear all saved scores?

Are you sure? You will lose all saved high scores for every level in this browser. The current game will also restart at zero, ready for a new player. This cannot be undone.

How to Play

Defend your base

Shoot the factors of the announced number. Survive each wave with at least one launcher standing. If all three launchers are destroyed, the game is over.

Aim, select and fire

Tap or click a numbered ship to fire. Shoot numbers that divide the target exactly; let the others land. Each launcher carries five missiles.

Keyboard: Left / right selects a ship; Space fires. A, S and D select launchers. P pauses.

Crystals and shields

Untouched non-factors land in the bays and give crystals. Five crystals add a shield charge; ten rebuild a destroyed launcher without a shield. A shield absorbs one hit. With no missiles left, landing ships give half a crystal.

The game pauses while these instructions are open.