Mad Keyhole — Indie Game Studio

We make puzzles
worth unlocking.

An indie game studio building honest, handcrafted puzzle games for mobile and PC.

Our Games

Small team, high standards. Every level we ship is verified by a solver before it reaches you.

PopSort! icon

PopSort!

Ball Sort Puzzle · Android

Tap, pour, sort. When a tube fills up with one color… POP! A relaxing colour-sorting puzzle that starts gentle and ends up bending your brain.

  • 50 handcrafted levels — every single one verified solvable
  • Daily Challenge and an Endless mode that never runs out
  • A hint that actually reads your board and solves it
  • Colourblind mode: every colour also has its own shape
  • 14 languages · plays offline · free
Coming soon to Google Play
PopSort! menu PopSort! gameplay PopSort! colourblind mode

In Development

What we're building next.

Steam · Coming soon

Escape Room (working title)

A first-person escape room where every lock has a logic — and every room has a story hiding behind it.

Ongoing

More PopSort! levels

Our level generator creates and verifies new puzzles in seconds, so content keeps coming after launch.

The Studio

Mad Keyhole is an independent game studio based in São Paulo, Brazil. We build puzzle games with one rule: never waste the player's time.

That means no impossible levels engineered to sell you a power-up, no fake hints, and no dark patterns. If our game says a puzzle can be solved, a solver has already proven it.

We care about the small things — the weight of a sound, the way a ball settles into a tube, whether someone with colour blindness can play at all.

50levels, each verified by solver
14languages at launch
0impossible levels. Ever.