A calm, fantastical idle clicker: sit with a boy and his black cat on a quiet night and gather star fragments.

How to play

• Click the glowing star (or Space / Enter) to collect star fragments; quick clicks build combos.
• Buy upgrades on the right (Q–U); the Black Cat Helper taps for you. Cast Star Magic with Shift+1–4.
• Catch golden shooting stars and rare colored stars for bonuses.
• Gather 100,000 fragments in a run to unlock Constellation Rebirth (P).

A growing night world

Your sky grows from Lv.1 to 10 with the Milky Way, moon phases, constellations, aurora and more. The bottom menu opens the upgrade tree, spells, furniture and room decorating, the codex, achievements, mini-games, a museum, photos (C), secrets and the Night Album. A whole night passes from dusk to dawn, with Night Records and special nights. Keys 1–6 open the menus.

Star Cores and Star Realms (v6)

• Rebirth now grants permanent Star Cores for five core trees in the Star Realm menu (key 7).
• A rebirth cutscene gathers your stars into a giant Star Core; the New World Tailwind then gives ×5 gains.
• Rebirth count evolves the sky: new constellation, Star Core meteors, the Star Core Prayer spell (Shift+5), a special nebula, a room lamp, Star Cat visits, Star Core Nights, the Second Star Realm and more.
• Your playstyle each run levels a re-equippable Star Form.
• After 10 rebirths, Astral Rebirth opens new universes with new rules.
• 18 Star Upgrades reach Lv.5000, evolve at Lv.100/250/500/1000, branch at Lv.50/150 and visibly enrich the sky.

Star Realm Records (v7)

• The bottom bar is now six items (Upgrade, Magic, Room, Codex, Achievements, More); the sky stays the star. Open the Star Realm Rank chip (top right) for the new records, and Detailed Status for full stats.
• Star Realm Rank (Lv.1–9999 with milestone titles, furniture and sky effects), a 1000-star map with unique IDs, 124 constellations whose lines return to the sky, very rare Phantom Nights, endless Star Research in 10 fields, 210 cat behaviors, 320 furniture in 64 sets, a telescope, Star Shard refining and permanent upgrades, the Infinite Star Realm up to 9999, 520 achievements (100 hidden) and a Completion screen leading to the True Star Realm.
• Existing saves carry over unchanged.

Progress saves automatically.