How to play Apsis: the rules in two minutes
Learn to play Apsis, the arrow puzzle on orbits: tap an arrow and it flies straight out if its path is clear, or bounces back and costs a heart if not.
The Apsis blog
Tips, strategy and how it's made
How to play, how to read a crowded sky, what the name means, and what goes into a puzzle game built by a two-person team.
Apsis beginner tips: seven habits that save hearts
Seven habits for Apsis: find the free arrows first, read the band and not the line, respect long arrows, and follow straight paths across curved orbits.
Calm by design: no timers, no energy, just the night sky
Why Apsis has no timers or energy, where its few ads sit, how three hearts keep it gentle, and what the sound, music and vibration settings do.
How Apsis levels are made: built backwards, scored by reads
Behind the scenes: how Apsis builds every level backwards so it can always be cleared, measures difficulty in reads, and makes sure no level repeats another.
How the hint works in Apsis, and why it is always right
What Apsis's hint shows, how it picks which arrow to light, why a hinted tap can never miss, and what happens if you ask while an arrow is still flying.
Made by two: how a person and an AI built Apsis
Apsis is made by Shravan Goswami and Claude Opus 5.5, an AI model by Anthropic. Who did what, how the work was checked, and what we learned building it.
Straight lines across circles: the geometry inside Apsis
How Apsis decides exactly what a flying arrow hits, why paths along an orbit catch their neighbours, and how the game works out which arrow your finger meant.
Three stars in Apsis: how hearts and misses are scored
Why Apsis scores misses instead of moves, how three hearts become your stars, what a miss really costs, and a simple routine for clearing levels without one.
What is an apsis? The astronomy behind the name
An apsis is the point in an orbit nearest to or farthest from the body it goes around: periapsis, apoapsis, perihelion and apogee, explained.