Voids march a golden road toward the Sun. Build the twelve zodiac signs to stop them.

Zodiac Siege is a tower defense game where today's real sky changes every battle. The game works out where the planets are, right on your phone. Mars in a Fire sign makes Fire hit harder. Saturn in the wrong place gives the Voids armour. No two days play the same.

TWELVE SIGNS, 144 UPGRADES
• Fire, Earth, Air and Water towers, each with a different job: burst damage, walls on the road, chain lightning, poison, slows.
• Every sign has three upgrade paths of four tiers. Pick your two, and the third locks.
• Twelve tier-4 abilities, from Aries' Stampede to Scorpio's Death Sting.
• New signs join as your Astrologer levels up.

HEROES
• Three constellation heroes: Orion the Hunter, Ophiuchus and Pegasus.
• Place one free in each battle. It levels up from the Voids popped near it, and gets an ability at level 3.
• Heroes are earned by playing, never bought.

BONDS AND GRAND TRINES
• Same-element towers that touch grow stronger together.
• Fire beside Air, or Earth beside Water, attack faster.
• Bond all three signs of an element into a Grand Trine to open its skill tree: Solar Flare, Tsunami, Earthquake or Tempest.

PLANET BOSSES
• Twenty waves, with a planet boss every fifth wave.
• Chiron heals the Voids. Mars enrages at half health. Uranus shocks your towers. Pluto comes back once.
• The date decides which planets you face.

TODAY'S SKY
• One battle a day, the same for everyone, with a shared leaderboard and a weekly board.
• Eclipses, full moons, Mercury retrograde and meteor showers turn into sky events, with bonus XP and a badge for a win.
• Send a friend a challenge link: the same battle, and your score to beat.

MORE TO PLAY
• Easy, Medium and Hard, plus challenge rules like Fire Only and No Selling.
• Freeplay after wave 20, for as long as you last.
• A Star Chart skill tree, a Journal of achievements, and an Almanac that explains every tower, Void and planet.
• Shapes for each element, for colour-blind play.

FREE TO PLAY, NO ADS
The whole campaign is free, with no ads. Optional packs add more:
• Outer Planets Pack: two maps and three hard challenges.
• Asteroid Belt Pack: two maps and four asteroid bosses.
• Celestial Skins: a starry look for every sign, and three Sun faces. Looks only.
• The Complete Sky: all three packs.

Signing in is optional. It saves your progress and puts your scores on the board. Packs you buy unlock wherever you sign in.

The sky effects are a game mechanic, not a horoscope.