Kessler Cascade

Every satellite you launch adds mass to the sky. Fit enough of them into orbit and you win. Pack them badly and one collision sets off a Kessler syndrome cascade that wipes out everything above it.

Kessler Cascade is a puzzle about timing, orbital mechanics and risk. Tap an orbit, pick your launch moment, and thread your satellite into a ring that's already full of traffic. Every orbit moves at its own speed. A bigger orbit is slower. An inclined orbit crosses the others. Get the timing wrong and you'll see why this is called a syndrome.

HOW IT WORKS • Eight orbit types per level, from low orbits to far orbits, inclined planes and elongated Molniya ellipses • Launch into a gap between satellites that are already there • A collision creates a debris cloud that blocks that orbit and the ones above it • Your score is the total mass you put into orbit, with bonus multipliers for filling out communications, imaging and navigation constellations • Levels get harder as the planet's mass drops, which makes orbits faster and the gaps smaller

LEVEL PACKS • MAIN: 30 levels, the first 5 free • MOON: a moon that travels around the planet, with low orbits around the moon itself, transfer orbits and a far-away L2 point • BINARY: two planets of different sizes, with orbits around each one and around both • RETROGRADE: orbits that run against the traffic, so you're flying head-on • DECAY: low orbits that fall and burn up, taking their mass with them, so speed and precision pay

FAIR AND SIMPLE • The first 5 levels are free • Each unlock is a one-time purchase, with no ads, no subscriptions and no energy timers • No account, no tracking, no data collected • Works on iPhone and iPad

How many satellites can you fit in orbit before it all comes down?

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