Penumbra Index

Spark relics to ignite beam chains across a shadowed celestial archive

Puzzle
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Released: Tuesday, March 10, 2026 Genre: Puzzle Controls: Mouse or tap to spark a relic or aim the sextant scan; keys 1/2 switch tools, Space starts Platform: Browser (desktop & mobile)

About this game

Spark a single artifact and watch its directional beams ignite neighbors in a spreading chain reaction across a grid. Each relic type fires along different lines and ranges, so plan your shot to maximize the chain and hit each wave's score target before your sparks run out. Use a limited sextant scan to reveal shadowed cells and bank upgrades between waves.

How to play

Mouse or tap to spark a relic or aim the sextant scan; keys 1/2 switch tools, Space starts Penumbra Index runs entirely in your browser — no download or sign-up. Press play above, or open it fullscreen for the best experience on phone or desktop.

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Penumbra Index is part of GameDaily.ai — a brand-new AI-generated browser game published every single day since Thursday, February 12, 2026. See how the games are made or browse the full archive of 464 games.