Black Hole Square

Play:

Maximise Touch: tap a piece to activate it; swipe left to advance or skip a puzzle, swipe right to reset it or go back · Keyboard: not required — played entirely by tap/click and swipe/drag (a mouse-wheel scroll also works as a swipe on desktop)

About:

Built for js13k 2021 (theme SPACE, 13KB size limit), Black Hole Square puts six mechanics on a 6x6 board across 18 hand-authored levels: tap an X-square away, tap a neutron star to collapse it into a black hole, or tap an arrow tile to shove every pushable piece in its row or column. The README mentions a paywalled set of 3 bonus puzzles, but the shipped build has that removed — reading the actual level data confirms all 18 levels are free, and playing through it confirms the same.

There is no menu. Swipe left to move forward through the puzzle sequence or skip one you're stuck on; swipe right to reset the current puzzle or step back to the last one. That is the entire control scheme, and it holds up: every tap in testing landed on the intended grid cell with a real touchscreen, and the same coordinates worked identically with a mouse on desktop.

Credits:

Made by Quinten Clause, 2021. Published here under the MIT licence. Source code. The author's own page for it.

Phone check: played through multiple levels on a simulated phone (390x844, real touchscreen taps and swipes) and on desktop (mouse click and drag) on 7 Sep 2026 — tap-driven arrow pushes, deletes and level navigation all confirmed working on both; zero console errors, zero failed requests

Tags:

puzzle · js13k · grid puzzle